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Raharinjatovo J, Dabiré RK, Esch K, Soma DD, Hien A, Camara T, Diouf MB, Belemvire A, Gerberg L, Awolola TS, Koné A, Jacob D, Vandecandelaere S, Baes M, Poyer S. Physical and insecticidal durability of Interceptor ®, Interceptor ® G2, and PermaNet ® 3.0 insecticide-treated nets in Burkina Faso: results of durability monitoring in three sites from 2019 to 2022. Malar J 2024; 23:173. [PMID: 38835017 DOI: 10.1186/s12936-024-04989-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2023] [Accepted: 05/16/2024] [Indexed: 06/06/2024] Open
Abstract
BACKGROUND National Malaria Programmes (NMPs) monitor the durability of insecticide-treated nets (ITNs) to inform procurement and replacement decisions. This is crucial for new dual active ingredients (AI) ITNs, for which less data is available. Pyrethroid-only ITN (Interceptor®) and dual AI (Interceptor® G2, and PermaNet® 3.0) ITNs were assessed across three health districts over 36 months in southern Burkina Faso to estimate median ITN survival, insecticidal efficacy, and to identify factors contributing to field ITN longevity. METHODS Durability was monitored through a prospective study of a cohort of nets distributed during the 2019 mass campaign. Three health districts were selected for their similar pyrethroid-resistance, environmental, epidemiological, and population profiles. Households were recruited after the mass campaign, with annual household questionnaire follow-ups over three years. Each round, ITNs were withdrawn for bioassays and chemical residue testing. Key measures were the percentage of cohort ITNs in serviceable condition, insecticidal effectiveness, and chemical residue content against target dose. Cox proportional hazard models were used to identify determinants influencing ITN survival. RESULTS At endline, the median useful life was 3.2 (95% CI 2.5-4.0) years for PermaNet® 3.0 ITNs in Orodara, 2.6 (95% CI 1.9-3.2) years for Interceptor® G2 ITNs in Banfora and 2.4 (95% CI 1.9-2.9) years for Interceptor® ITNs in Gaoua. Factors associated with ITN survival included cohort ITNs from Orodara (adjusted hazard ratio (aHR) = 0.58, p = 0.026), households seeing less rodents (aHR = 0.66, p = 0.005), female-headed households (aHR = 0.66, p = 0.044), exposure to social behavior change (SBC) messages (aHR = 0.52, ≤ 0.001) and folding nets when not in use (aHR = 0.47, p < 0.001). At endline, PermaNet® 3.0 ITN recorded 24-h mortality of 26% against resistant mosquitos on roof panels, with an 84% reduction in PBO content. Interceptor® G2 ITN 72-h mortality was 51%, with a 67% reduction in chlorfenapyr content. Interceptor® ITN 24-h mortality was 71%, with an 84% reduction in alpha-cypermethrin content. CONCLUSION Only PermaNet® 3.0 ITNs surpassed the standard three-year survival threshold. Identified protective factors should inform SBC messaging. Significant decreases in chemical content and resulting impact on bioefficacy warrant more research in other countries to better understand dual AI ITN insecticidal performance.
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Affiliation(s)
- Jacky Raharinjatovo
- PMI VectorLink Project, Population Services International, Antananarivo, Madagascar.
| | | | - Keith Esch
- PMI VectorLink Project, Population Services International, Washington, DC, USA
| | | | - Aristide Hien
- Institut de Recherche en Sciences de La Santé, Bobo-Dioulasso, Burkina Faso
| | - Tiecoura Camara
- Burkina Faso Permanent Secretariat for Malaria Elimination, Ouagadougou, Burkina Faso
| | | | | | - Lilia Gerberg
- U.S. President's Malaria Initiative, USAID, Washington, DC, USA
| | - Taiwo Samson Awolola
- U.S. President's Malaria Initiative, Malaria Branch, US Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - Adama Koné
- PMI VectorLink Project, Abt Associates, Ouagadougou, Burkina Faso
| | - Djenam Jacob
- PMI VectorLink Project, Abt Associates, Washington, DC, USA
| | | | - Marie Baes
- Centres Wallon de Recherches Agronomiques, Gembloux, Belgium
| | - Stephen Poyer
- PMI VectorLink Project, Population Services International, Washington, DC, USA
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Ekra AK, Edi CAV, Gbalegba GCN, Zahouli JZB, Danho M, Koudou BG. Can neonicotinoid and pyrrole insecticides manage malaria vector resistance in high pyrethroid resistance areas in Côte d'Ivoire? Malar J 2024; 23:160. [PMID: 38778399 PMCID: PMC11112771 DOI: 10.1186/s12936-024-04917-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2023] [Accepted: 03/23/2024] [Indexed: 05/25/2024] Open
Abstract
BACKGROUND Anopheles mosquito resistance to insecticide remains a serious threat to malaria vector control affecting several sub-Sahara African countries, including Côte d'Ivoire, where high pyrethroid, carbamate and organophosphate resistance have been reported. Since 2017, new insecticides, namely neonicotinoids (e.g.; clothianidin) and pyrroles (e.g.; chlorfenapyr) have been pre-qualified by the World Health Organization (WHO) for use in public health to manage insecticide resistance for disease vector control. METHODS Clothianidin and chlorfenapyr were tested against the field-collected Anopheles gambiae populations from Gagnoa, Daloa and Abengourou using the WHO standard insecticide susceptibility biossays. Anopheles gambiae larvae were collected from several larval habitats, pooled and reared to adulthood in each site in July 2020. Non-blood-fed adult female mosquitoes aged 2 to 5 days were exposed to diagnostic concentration deltamethrin, permethrin, alpha-cypermethrin, bendiocarb, and pirimiphos-methyl. Clothianidin 2% treated papers were locally made and tested using WHO tube bioassay while chlorfenapyr (100 µg/bottle) was evaluated using WHO bottle assays. Furthermore, subsamples of exposed mosquitoes were identified to species and genotyped for insecticide resistance markers including the knock-down resistance (kdr) west and east, and acetylcholinesterase (Ace-1) using molecular techniques. RESULTS High pyrethroid resistance was recorded with diagnostic dose in Abengourou (1.1 to 3.4% mortality), in Daloa (15.5 to 33.8%) and in Gagnoa (10.3 to 41.6%). With bendiocarb, mortality rates ranged from 49.5 to 62.3%. Complete mortality (100% mortality) was recorded with clothianidin in Gagnoa, 94.9% in Daloa and 96.6% in Abengourou, while susceptibility (mortality > 98%) to chlorfenapyr 100 µg/bottle was recorded at all sites and to pirimiphos-methyl in Gagnoa and Abengourou. Kdr-west mutation was present at high frequency (0.58 to 0.73) in the three sites and Kdr-east mutation frequency was recorded at a very low frequency of 0.02 in both Abengourou and Daloa samples and absent in Gagnoa. The Ace-1 mutation was present at frequencies between 0.19 and 0.29 in these areas. Anopheles coluzzii represented 100% of mosquitoes collected in Daloa and Gagnoa, and 72% in Abengourou. CONCLUSIONS This study showed that clothianidin and chlorfenapyr insecticides induce high mortality in the natural and pyrethroid-resistant An. gambiae populations in Côte d'Ivoire. These results could support a resistance management plan by proposing an insecticide rotation strategy for vector control interventions.
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Affiliation(s)
- Armand K Ekra
- UMRI 28, Sciences Agronomiques et Procédés de Transformation, Laboratoire de Zoologie Agricole et Entomologie, Institut National Polytechnique Félix Houphouët-Boigny (INP-HB), Yamoussoukro, République de Côte d'Ivoire.
- Centre Suisse de Recherches Scientifiques en Côte d'Ivoire, Abidjan, République de Côte d'Ivoire.
| | - Constant A V Edi
- Centre Suisse de Recherches Scientifiques en Côte d'Ivoire, Abidjan, République de Côte d'Ivoire
| | | | - Julien Z B Zahouli
- Centre Suisse de Recherches Scientifiques en Côte d'Ivoire, Abidjan, République de Côte d'Ivoire
- Centre d'Entomologie Médicale et Vétérinaire, Université Alassane Ouattara, Bouaké, République de Côte d'Ivoire
| | - Mathias Danho
- UMRI 28, Sciences Agronomiques et Procédés de Transformation, Laboratoire de Zoologie Agricole et Entomologie, Institut National Polytechnique Félix Houphouët-Boigny (INP-HB), Yamoussoukro, République de Côte d'Ivoire
| | - Benjamin G Koudou
- Centre Suisse de Recherches Scientifiques en Côte d'Ivoire, Abidjan, République de Côte d'Ivoire
- Laboratoire d'Entomologie, UFR Sciences de la Nature, Université Nangui Abrogoua, Abidjan, République de Côte d'Ivoire
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Agboka KM, Wamalwa M, Mutunga JM, Tonnang HEZ. A mathematical model for mapping the insecticide resistance trend in the Anopheles gambiae mosquito population under climate variability in Africa. Sci Rep 2024; 14:9850. [PMID: 38684842 PMCID: PMC11059405 DOI: 10.1038/s41598-024-60555-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2023] [Accepted: 04/24/2024] [Indexed: 05/02/2024] Open
Abstract
The control of arthropod disease vectors using chemical insecticides is vital in combating malaria, however the increasing insecticide resistance (IR) poses a challenge. Furthermore, climate variability affects mosquito population dynamics and subsequently IR propagation. We present a mathematical model to decipher the relationship between IR in Anopheles gambiae populations and climate variability. By adapting the susceptible-infected-resistant (SIR) framework and integrating temperature and rainfall data, our model examines the connection between mosquito dynamics, IR, and climate. Model validation using field data achieved 92% accuracy, and the sensitivity of model parameters on the transmission potential of IR was elucidated (e.g. μPRCC = 0.85958, p-value < 0.001). In this study, the integration of high-resolution covariates with the SIR model had a significant impact on the spatial and temporal variation of IR among mosquito populations across Africa. Importantly, we demonstrated a clear association between climatic variability and increased IR (width = [0-3.78], α = 0.05). Regions with high IR variability, such as western Africa, also had high malaria incidences thereby corroborating the World Health Organization Malaria Report 2021. More importantly, this study seeks to bolster global malaria combat strategies by highlighting potential IR 'hotspots' for targeted intervention by National malria control programmes.
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Affiliation(s)
- Komi Mensah Agboka
- International Centre of Insect Physiology and Ecology (Icipe), P.O. Box 30772 00100, Nairobi, Kenya.
| | - Mark Wamalwa
- International Centre of Insect Physiology and Ecology (Icipe), P.O. Box 30772 00100, Nairobi, Kenya
| | - James Mutuku Mutunga
- School of Engineering Design and Innovation Pennsylvania State University, University Park, PA, 16802, USA
| | - Henri E Z Tonnang
- International Centre of Insect Physiology and Ecology (Icipe), P.O. Box 30772 00100, Nairobi, Kenya.
- School of Agricultural, Earth, and Environmental Sciences, University of KwaZulu-Natal, Pietermaritzburg, 3209, South Africa.
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Yadouleton A, Badou Y, Sanoussi F, Hounkanrin G, Tchibozo C, Adewumi P, Baba-Moussa L. Development of rice farming: a cause of the emergence of multiple insecticide resistance in populations of Anopheles gambiae s.l and its impact on human health in Malanville, Bénin. Malawi Med J 2023; 35:170-176. [PMID: 38362286 PMCID: PMC10865060 DOI: 10.4314/mmj.v35i3.6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2024] Open
Abstract
Aim The rise in rice production in the district of Malanville, Northen Benin, is a present concern, as it has resulted in the widespread usage of pesticides for crop protection. This could impact human health but also life cycle of Anopheles gambiae, the main vector of malaria. Methods Therefore, insecticide susceptibility bioassays were carried out on populations of An. gambiae s.l aged to 3-5 days old (two from areas where insecticide is highly used and other two areas of low insecticide use) and subjected to insecticide-impregnated papers (Permethrin 0.75%; deltamethrin 0.05%; DDT 4% and bendiocarb 0.1%) following WHO protocol. Polymerase Chain Reactions (PCRs) were used for the detection of Acethlylcholinestrase (Ace-1) and the knock down resistance (kdr) L1014F mutations in An. gambiae populations. Finally, indirect bioassays were conducted for the investigating on the factors affecting the life cycle of An. gambiae due to the use of pesticides. Results An. gambiae from the four sites were resistant to DDT (6 to 8% and 10 to 14% respectively from areas of high and low dose), pyrethroids (22 to 26% and 30 to 36% for permethrin, from areas of high and low dose respectively and 66 to 70% and 72 to 80% for deltamethrin, from high and low dose) but susceptible to carbamate. The kdr L1014F mutation was detected in An. gambiae populations (0.88 to 0.90 and 0.84 to 0.88 from high and low dose, respectively). The ace-1 was detected at low frequencies (<0.002). Bioassays on the impacts of the use of pesticides in the life cycle of An. gambiae showed that soil substrates with pesticides residues have a negative impact on the life cycle eggs of An. gambiae. Conclusion These findings confirmed the negative impacts of pesticides use in rice farming and its impacts on the life cycle of An. gambiae.
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Affiliation(s)
- Anges Yadouleton
- Ecole Normale Supérieure de Natitingou ; Université Nationale des Sciences, Technologies, Ingénierie et Mathématiques (UNSTIM)
- Centre de Recherche Entomologique de Cotonou
- Laboratoire des Fièvres Hémorragiques Virales et des Arbovirus du Bénin
| | - Yvette Badou
- Laboratoire des Fièvres Hémorragiques Virales et des Arbovirus du Bénin
| | - Falilath Sanoussi
- Laboratoire des Fièvres Hémorragiques Virales et des Arbovirus du Bénin
| | - Gildas Hounkanrin
- Laboratoire des Fièvres Hémorragiques Virales et des Arbovirus du Bénin
| | - Carine Tchibozo
- Laboratoire des Fièvres Hémorragiques Virales et des Arbovirus du Bénin
| | - Praise Adewumi
- Laboratoire des Fièvres Hémorragiques Virales et des Arbovirus du Bénin
| | - Lamine Baba-Moussa
- Laboratoire de Biologie et de Typage Moléculaire en Microbiologie/Département de Biochimie et de Biologie Cellulaire/Faculté des Sciences et Techniques/Université d'Abomey-Calavi/ 05 BP 1604 Cotonou, Benin
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Kefi M, Balabanidou V, Sarafoglou C, Charamis J, Lycett G, Ranson H, Gouridis G, Vontas J. ABCH2 transporter mediates deltamethrin uptake and toxicity in the malaria vector Anopheles coluzzii. PLoS Pathog 2023; 19:e1011226. [PMID: 37585450 PMCID: PMC10461823 DOI: 10.1371/journal.ppat.1011226] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Revised: 08/28/2023] [Accepted: 07/28/2023] [Indexed: 08/18/2023] Open
Abstract
Contact insecticides are primarily used for the control of Anopheles malaria vectors. These chemicals penetrate mosquito legs and other appendages; the first barriers to reaching their neuronal targets. An ATP-Binding Cassette transporter from the H family (ABCH2) is highly expressed in Anopheles coluzzii legs, and further induced upon insecticide exposure. RNAi-mediated silencing of the ABCH2 caused a significant increase in deltamethrin mortality compared to control mosquitoes, coincident with a corresponding increase in 14C-deltamethrin penetration. RT-qPCR analysis and immunolocalization revealed ABCH2 to be mainly localized in the legs and head appendages, and more specifically, the apical part of the epidermis, underneath the cuticle. To unravel the molecular mechanism underlying the role of ABCH2 in modulating pyrethroid toxicity, two hypotheses were investigated: An indirect role, based on the orthology with other insect ABCH transporters involved with lipid transport and deposition of CHC lipids in Anopheles legs which may increase cuticle thickness, slowing down the penetration rate of deltamethrin; or the direct pumping of deltamethrin out of the organism. Evaluation of the leg cuticular hydrocarbon (CHC) content showed no affect by ABCH2 silencing, indicating this protein is not associated with the transport of leg CHCs. Homology-based modeling suggested that the ABCH2 half-transporter adopts a physiological homodimeric state, in line with its ability to hydrolyze ATP in vitro when expressed on its own in insect cells. Docking analysis revealed a deltamethrin pocket in the homodimeric transporter. Furthermore, deltamethrin-induced ATP hydrolysis in ABCH2-expressing cell membranes, further supports that deltamethrin is indeed an ABCH2 substrate. Overall, our findings pinpoint ABCH2 participating in deltamethrin toxicity regulation.
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Affiliation(s)
- Mary Kefi
- Department of Biology, University of Crete, Vassilika Vouton, Heraklion, Greece
- Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology-Hellas, Heraklion, Greece
| | - Vasileia Balabanidou
- Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology-Hellas, Heraklion, Greece
| | - Chara Sarafoglou
- Department of Biology, University of Crete, Vassilika Vouton, Heraklion, Greece
- Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology-Hellas, Heraklion, Greece
| | - Jason Charamis
- Department of Biology, University of Crete, Vassilika Vouton, Heraklion, Greece
- Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology-Hellas, Heraklion, Greece
| | - Gareth Lycett
- Department of Vector Biology, Liverpool School of Tropical Medicine, Pembroke Place, Liverpool, United Kingdom
| | - Hilary Ranson
- Department of Vector Biology, Liverpool School of Tropical Medicine, Pembroke Place, Liverpool, United Kingdom
| | - Giorgos Gouridis
- Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology-Hellas, Heraklion, Greece
| | - John Vontas
- Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology-Hellas, Heraklion, Greece
- Pesticide Science Laboratory, Department of Crop Science, Agricultural University of Athens, Athens, Greece
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Gnambani EJ, Bilgo E, Dabiré RK, Belem AMG, Diabaté A. Infection of the malaria vector Anopheles coluzzii with the entomopathogenic bacteria Chromobacterium anophelis sp. nov. IRSSSOUMB001 reduces larval survival and adult reproductive potential. Malar J 2023; 22:122. [PMID: 37055834 PMCID: PMC10103495 DOI: 10.1186/s12936-023-04551-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Accepted: 04/01/2023] [Indexed: 04/15/2023] Open
Abstract
BACKGROUND Vector control tools are urgently needed to control malaria transmission in Africa. A native strain of Chromobacterium sp. from Burkina Faso was recently isolated and preliminarily named Chromobacterium anophelis sp. nov. IRSSSOUMB001. In bioassays, this bacterium showed a promising virulence against adult mosquitoes and reduces their blood feeding propensity and fecundity. The current study assessed the entomopathogenic effects of C. anophelis IRSSSOUMB001 on larval stages of mosquitoes, as well as its impacts on infected mosquitoes reproductive capacity and trans-generational effects. METHODS Virulence on larvae and interference with insemination were assayed by co-incubation with C. anophelis IRSSSOUMB001 at a range of 104 to 108 cfu/ml. Trans-generational effects were determined by measuring body size differences of progeny from infected vs. uninfected parent mosquitoes using wing size as a proxy. RESULTS Chromobacterium anophelis IRSSSOUMB001 killed larvae of the pyrethroid-resistant Anopheles coluzzii with LT80 of ~ 1.75 ± 0.14 days at 108 cfu/ml in larval breeding trays. Reproductive success was reduced as a measure of insemination rate from 95 ± 1.99% to 21 ± 3.76% for the infected females. There was a difference in wing sizes between control and infected mosquito offsprings from 2.55 ± 0.17 mm to 2.1 ± 0.21 mm in infected females, and from 2.43 ± 0.13 mm to 1.99 ± 0.15 mm in infected males. CONCLUSIONS This study showed that C. anophelis IRSSSOUMB001 was highly virulent against larvae of insecticide-resistant Anopheles coluzzii, and reduced both mosquito reproduction capacity and offspring fitness. Additional laboratory, field, safety and social acceptance studies are needed to draw firm conclusions about the practical utility of this bacterial strain for malaria vector control.
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Affiliation(s)
- Edounou Jacques Gnambani
- Institut de Recherche en Sciences de la Santé (IRSS) Direction Régionale de l'Ouest (DRO)/CNRST, Bobo-Dioulasso, Burkina Faso
- Institut National de Santé Publique (INSP), Centre Muraz, Bobo Dioulasso, Burkina Faso
- Centre d'Excellence Africain en Innovations Biotechnologiques Pour l'Elimination des Maladies à Transmission Vectorielle (CEA-ITECH/MTV)/Université Nazi Boni (UNB), Bobo Dioulasso, Burkina Faso
| | - Etienne Bilgo
- Institut de Recherche en Sciences de la Santé (IRSS) Direction Régionale de l'Ouest (DRO)/CNRST, Bobo-Dioulasso, Burkina Faso.
- Institut National de Santé Publique (INSP), Centre Muraz, Bobo Dioulasso, Burkina Faso.
- Centre d'Excellence Africain en Innovations Biotechnologiques Pour l'Elimination des Maladies à Transmission Vectorielle (CEA-ITECH/MTV)/Université Nazi Boni (UNB), Bobo Dioulasso, Burkina Faso.
| | - Roch K Dabiré
- Institut de Recherche en Sciences de la Santé (IRSS) Direction Régionale de l'Ouest (DRO)/CNRST, Bobo-Dioulasso, Burkina Faso
- Institut National de Santé Publique (INSP), Centre Muraz, Bobo Dioulasso, Burkina Faso
- Centre d'Excellence Africain en Innovations Biotechnologiques Pour l'Elimination des Maladies à Transmission Vectorielle (CEA-ITECH/MTV)/Université Nazi Boni (UNB), Bobo Dioulasso, Burkina Faso
| | | | - Abdoulaye Diabaté
- Institut de Recherche en Sciences de la Santé (IRSS) Direction Régionale de l'Ouest (DRO)/CNRST, Bobo-Dioulasso, Burkina Faso.
- Institut National de Santé Publique (INSP), Centre Muraz, Bobo Dioulasso, Burkina Faso.
- Centre d'Excellence Africain en Innovations Biotechnologiques Pour l'Elimination des Maladies à Transmission Vectorielle (CEA-ITECH/MTV)/Université Nazi Boni (UNB), Bobo Dioulasso, Burkina Faso.
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Rants'o TA, Koekemoer LL, van Zyl RL. The insecticidal activity of essential oil constituents against pyrethroid-resistant Anopheles funestus (Diptera: Culicidae). Parasitol Int 2023; 95:102749. [PMID: 36898498 DOI: 10.1016/j.parint.2023.102749] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2023] [Revised: 03/03/2023] [Accepted: 03/07/2023] [Indexed: 03/12/2023]
Abstract
Malaria vector control relies on the use of insecticides for indoor residual spraying and long-lasting bed nets. However, insecticide resistance to pyrethroids among others, has escalated. Anopheles funestus, one of the major African malaria vectors, has attained significant levels of resistance to pyrethroids. Overexpressed P450 monooxygenases have been previously identified in pyrethroid resistant An. funestus. The escalating resistance against conventional insecticides signals an urgent need for identification of novel insecticides. Essential oils have gained recognition as promising sources of alternative natural insecticides. This study investigated six essential oil constituents, farnesol, (-)-α-bisabolol, cis-nerolidol, trans-nerolidol, methyleugenol, santalol (α and β isomers) and essential oil of sandalwood, for the adulticidal effects against pyrethroid-resistant An. funestus strain. The susceptibility against these terpenoids were evaluated on both pyrethroid-susceptible and resistant An. funestus. Furthermore, the presence of overexpressed monooxygenases in resistant An. funestus was confirmed. Results showed that both the pyrethroid-susceptible and resistant An. funestus were susceptible to three EOCs; cis-nerolidol, trans-nerolidol and methyleugenol. On the other hand, the pyrethroid-resistant An. funestus survived exposure to both farnesol and (-)-α-bisabolol. This study however does not show any direct association of the overexpressed Anopheles monooxygenases and the efficacy of farnesol and (-)-α-bisabolol. The enhanced activity of these terpenoids against resistant An. funestus that has been pre-exposed to a synergist, piperonyl butoxide, suggests their potential effectiveness in combination with monooxygenase inhibitors. This study proposes that cis-nerolidol, trans-nerolidol and methyleugenol are potential agents for further investigation as novel bioinsecticides against pyrethroid-resistant An. funestus strain.
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Affiliation(s)
- Thankhoe A Rants'o
- Pharmacology Division, Department of Pharmacy and Pharmacology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa; WITS Research Institute for Malaria, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa.
| | - Lizette L Koekemoer
- WITS Research Institute for Malaria, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa; School of Pathology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa; Centre for Emerging Zoonotic and Parasitic Diseases, National Institute for Communicable Diseases of the National Health Laboratory Service, Johannesburg, South Africa
| | - Robyn L van Zyl
- Pharmacology Division, Department of Pharmacy and Pharmacology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa; WITS Research Institute for Malaria, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
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Apetogbo Y, Ahadji-Dabla KM, Soma DD, Amoudji AD, Koffi E, Akagankou KI, Bamogo R, Ngaffo KL, Maiga S, Atcha-Oubou RT, Dorkenoo AM, Vizcaino L, Lenhart A, Diabaté A, Dabiré RK, Ketoh GK. Insecticide resistance intensity and efficacy of synergists with pyrethroids in Anopheles gambiae (Diptera: Culicidae) from Southern Togo. Malar J 2022; 21:353. [PMID: 36437444 PMCID: PMC9703766 DOI: 10.1186/s12936-022-04377-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Accepted: 11/10/2022] [Indexed: 11/29/2022] Open
Abstract
BACKGROUND This study was designed to provide insecticide resistance data for decision-making in terms of resistance management plans in Togo. METHODS The susceptibility status of Anopheles gambiae sensu lato (s.l.) to insecticides used in public health was assessed using the WHO tube test protocol. Pyrethroid resistance intensity bioassays were performed following the CDC bottle test protocol. The activity of detoxification enzymes was tested using the synergists piperonyl butoxide, S.S.S-tributlyphosphorotrithioate and ethacrinic acid. Species-specific identification of An. gambiae s.l. and kdr mutation genotyping were performed using PCR techniques. RESULTS Local populations of An. gambiae s.l. showed full susceptibility to pirimiphos methyl at Lomé, Kovié, Anié, and Kpèlè Toutou. At Baguida, mortality was 90%, indicating possible resistance to pirimiphos methyl. Resistance was recorded to DDT, bendiocarb, and propoxur at all sites. A high intensity of pyrethroid resistance was recorded and the detoxification enzymes contributing to resistance were oxidases, esterases, and glutathione-s-transferases based on the synergist tests. Anopheles gambiae sensu stricto (s.s.) and Anopheles coluzzii were the main species identified. High kdr L1014F and low kdr L1014S allele frequencies were detected at all localities. CONCLUSION This study suggests the need to reinforce current insecticide-based malaria control interventions (IRS and LLINs) with complementary tools.
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Affiliation(s)
- Yawo Apetogbo
- Laboratoire d'Ecologie et d'Ecotoxicologie, Faculté des Sciences, Université de Lomé, 01 B.P. 1515, Lomé 01, Togo. .,Institut de Recherche en Sciences de la Santé/Centre Muraz, 01 B.P. 545 , Bobo‑Dioulasso 01, Burkina Faso. .,Centre d'Excellence Africaine d'Innovation biotechnologique pour l'Elimination des Maladies à Transmission Vectorielle (CEA-ITECH-MTV), Université Nazi Boni, 01 B.P. 545 , Bobo‑Dioulasso 01, Burkina Faso.
| | - Koffi M Ahadji-Dabla
- Laboratoire d'Ecologie et d'Ecotoxicologie, Faculté des Sciences, Université de Lomé, 01 B.P. 1515, Lomé 01, Togo.
| | - Dieudonné Diloma Soma
- Institut de Recherche en Sciences de la Santé/Centre Muraz, 01 B.P. 545 , Bobo‑Dioulasso 01, Burkina Faso
| | - Adjovi D Amoudji
- Laboratoire d'Ecologie et d'Ecotoxicologie, Faculté des Sciences, Université de Lomé, 01 B.P. 1515, Lomé 01, Togo
| | - Edoh Koffi
- Laboratoire d'Ecologie et d'Ecotoxicologie, Faculté des Sciences, Université de Lomé, 01 B.P. 1515, Lomé 01, Togo
| | - Kossivi I Akagankou
- Laboratoire d'Ecologie et d'Ecotoxicologie, Faculté des Sciences, Université de Lomé, 01 B.P. 1515, Lomé 01, Togo
| | - Rabila Bamogo
- Institut de Recherche en Sciences de la Santé/Centre Muraz, 01 B.P. 545 , Bobo‑Dioulasso 01, Burkina Faso
| | - Kelly Lionelle Ngaffo
- Institut de Recherche en Sciences de la Santé/Centre Muraz, 01 B.P. 545 , Bobo‑Dioulasso 01, Burkina Faso.,Centre d'Excellence Africaine d'Innovation biotechnologique pour l'Elimination des Maladies à Transmission Vectorielle (CEA-ITECH-MTV), Université Nazi Boni, 01 B.P. 545 , Bobo‑Dioulasso 01, Burkina Faso
| | - Samina Maiga
- Institut de Recherche en Sciences de la Santé/Centre Muraz, 01 B.P. 545 , Bobo‑Dioulasso 01, Burkina Faso
| | - Rachid T Atcha-Oubou
- Programme National de Lutte contre le Paludisme/Ministère de la Santé, 01 B.P. 518, Lomé 01, Togo
| | - Ameyo M Dorkenoo
- Faculté des Sciences de la Santé, Université de Lomé, 01 B.P. 1515, Lomé 01, Togo
| | - Lucrecia Vizcaino
- Center for Global Health, Division of Parasitic Diseases and Malaria/Entomology Branch, Centers for Disease Control and Prevention (CDC), Atlanta, GA, 30329, USA
| | - Audrey Lenhart
- Center for Global Health, Division of Parasitic Diseases and Malaria/Entomology Branch, Centers for Disease Control and Prevention (CDC), Atlanta, GA, 30329, USA
| | - Abdoulaye Diabaté
- Institut de Recherche en Sciences de la Santé/Centre Muraz, 01 B.P. 545 , Bobo‑Dioulasso 01, Burkina Faso.,Centre d'Excellence Africaine d'Innovation biotechnologique pour l'Elimination des Maladies à Transmission Vectorielle (CEA-ITECH-MTV), Université Nazi Boni, 01 B.P. 545 , Bobo‑Dioulasso 01, Burkina Faso
| | - Roch Kounbobr Dabiré
- Institut de Recherche en Sciences de la Santé/Centre Muraz, 01 B.P. 545 , Bobo‑Dioulasso 01, Burkina Faso.,Centre d'Excellence Africaine d'Innovation biotechnologique pour l'Elimination des Maladies à Transmission Vectorielle (CEA-ITECH-MTV), Université Nazi Boni, 01 B.P. 545 , Bobo‑Dioulasso 01, Burkina Faso
| | - Guillaume Koffivi Ketoh
- Laboratoire d'Ecologie et d'Ecotoxicologie, Faculté des Sciences, Université de Lomé, 01 B.P. 1515, Lomé 01, Togo
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9
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Bayili K, Ki HD, Bayili B, Sow B, Ouattara A, Small G, Hien AS, Dabire RK, Diabate A. Laboratory and experimental hut trial evaluation of VECTRON™ T500 for indoor residual spraying (IRS) against insecticide resistant malaria vectors in Burkina Faso. Gates Open Res 2022; 6:57. [PMID: 35950163 PMCID: PMC9326088 DOI: 10.12688/gatesopenres.13578.2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/28/2022] [Indexed: 11/20/2022] Open
Abstract
Background: Malaria cases in some areas could be attributed to vector resistant to the insecticide. World Health Organization recommended insecticides for vector control are limited in number. It is essential to find rotational partners for existing Indoor Residual Spraying (IRS) products. VECTRON™ T500 is a novel insecticide with broflanilide as active ingredient. It has a mode of action on mosquitoes completely different to usually used. The aim of this study was to determine the optimum effective dose and efficacy of VECTRONTM T500 against susceptible and resistant strains of Anopheles in Burkina Faso. Methods: VECTRON™T500 was sprayed at 50, 100 and 200 mg/m² doses onto mud and concrete blocks using Potter Spray Tower. The residual activity of broflanilide was assessed through cone bioassays 1 week and then monthly up to 14 months post spraying. Its efficacy was evaluated at 100 and 150 mg/m² against wild free-flying mosquitoes in experimental huts on both substrates. Actellic 300CS was applied at 1000 mg/m² as reference product. Cone assays were conducted monthly, using susceptible and resistant mosquito strains. Results: In the laboratory, VECTRON™ T500 showed residual efficacy (≥80% mortality) on An. gambiae Kisumu up to 12 and 14 months, respectively, on concrete and mud blocks. Similar results were found with 100 and 200 mg/m² using An. coluzzii pyrethroid resistant strain. In experimental huts, a total of 19,552 An. gambiae s.l. were collected. Deterrence, blood-feeding inhibition and exophily with VECTRON™ treated huts were very low. At 100 and 150 mg/m², mortality of wild An. gambiae s.l. ranged between 55% and 73%. Monthly cone bioassay mortality remained >80% up to 9 months. Conclusions: VECTRON™ T500 shows great potential as IRS formulation for malaria vector control. It can be added to the arsenal of IRS products for use in rotations to control malaria and manage mosquito insecticide resistance.
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Affiliation(s)
- Koama Bayili
- Entomologist, Institut de Recherche en Sciences de la Santé, Bobo-dioulasso, 545, Burkina Faso
| | - Hyacinthe D. Ki
- Entomologist, Institut de Recherche en Sciences de la Santé, Bobo-dioulasso, 545, Burkina Faso
| | - Bazoma Bayili
- Entomologist, Institut de Recherche en Sciences de la Santé, Bobo-dioulasso, 545, Burkina Faso
- Entomologist, Université Nazi Boni, Bobo-Dioulasso, Burkina Faso
| | - Bazoumana Sow
- Entomologist, Institut de Recherche en Sciences de la Santé, Bobo-dioulasso, 545, Burkina Faso
- Entomologist, Université Nazi Boni, Bobo-Dioulasso, Burkina Faso
| | - Abdoulaye Ouattara
- Entomologist, Institut de Recherche en Sciences de la Santé, Bobo-dioulasso, 545, Burkina Faso
| | - Graham Small
- Senior Technical Manager, Innovative Vector Control Consortium, Liverpool, Liverpool L3 5QA, UK
| | - Aristide S. Hien
- Institut de Recherche en Sciences de la Santé, Bobo-Dioulasso, Burkina Faso
| | - Roch K. Dabire
- Entomologist, Institut de Recherche en Sciences de la Santé, Bobo-dioulasso, 545, Burkina Faso
| | - Abdoulaye Diabate
- Entomologist, Institut de Recherche en Sciences de la Santé, Bobo-dioulasso, 545, Burkina Faso
- Entomologist, Université Nazi Boni, Bobo-Dioulasso, Burkina Faso
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10
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Sangaré I, Ouattara CA, Soma DD, Soma D, Assogba BS, Namountougou M, Tougri G, Savadogo LB. Spatial-temporal pattern of malaria in Burkina Faso from 2013 to 2020. Parasite Epidemiol Control 2022; 18:e00261. [PMID: 35859938 PMCID: PMC9289732 DOI: 10.1016/j.parepi.2022.e00261] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Revised: 06/04/2022] [Accepted: 06/29/2022] [Indexed: 11/16/2022] Open
Abstract
Despite the implementation of different strategies to fight against malaria in Burkina Faso since 2005, it remains today the leading cause of hospitalization and death. Adapting interventions to the spatial and temporal distribution of malaria could help to reduce this burden. This study aims to determine the structure and stability of malaria hotspots in Burkina Faso, with the objective of adapting interventions at small geographical scales. Data on malaria cases from 2013 to 2020 were acquired at municipalities level. Municipality-wise malaria endemicity levels were mapped through geographical information system (GIS) tools. Spatial statistical analysis using Kulldoff sweeps were carried out to identify malaria hotspots. Then we mapped the monthly malaria risk. Malaria is endemic in all the municipalities of Burkina Faso. However, two stable main spatial clusters (South-Western and Eastern part of the country) are emerging with seasonal reinforcement. Interventions targeting the identified clusters could significantly reduce the incidence of malaria in Burkina Faso. This also prompts for further studies to identify the local determinants of this high transmission for the future success of malaria control.
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11
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Bayili K, Ki HD, Bayili B, Sow B, Ouattara A, Small G, Dabire RK, Diabate A. Laboratory and experimental hut trial evaluation of VECTRON™ T500 for indoor residual spraying (IRS) against insecticide resistant malaria vectors in Burkina Faso. Gates Open Res 2022; 6:57. [DOI: 10.12688/gatesopenres.13578.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/20/2022] [Indexed: 11/20/2022] Open
Abstract
Background: Malaria cases in some areas could be attributed to vector resistant to the insecticide. World Health Organization recommended insecticides for vector control are limited in number. It is essential to find rotational partners for existing Indoor Residual Spraying (IRS) products. VECTRON™ T500 is a novel insecticide with broflanilide as active ingredient. It has a mode of action on mosquitoes completely different to usually used. The aim of this study was to determine the optimum effective dose and efficacy of VECTRONTM against susceptible and resistant strains of Anopheles in Burkina Faso. Methods: VECTRON™ was sprayed at 50, 100 and 200 mg/m² doses onto mud and concrete blocks using Potter Spray Tower. The residual activity of broflanilide was assessed through cone bioassays 1 week and then monthly up to 14 months post spraying. Its efficacy was evaluated at 100 and 150 mg/m² against wild free-flying mosquitoes in experimental huts on both substrates. Actellic 300CS was applied at 1000 mg/m² as reference product. Cone assays were conducted monthly, using susceptible and resistant mosquito strains. Results: In the laboratory, VECTRON™ showed residual efficacy (≥80% mortality) on An. gambiae Kisumu up to 12 and 14 months, respectively, on concrete and mud blocks. Similar results were found with 100 and 200 mg/m² using An. coluzzii pyrethroid resistant strain. In experimental huts, a total of 19,552 An. gambiae s.l. were collected. Deterrence, blood-feeding inhibition and exophily with VECTRON™ treated huts were very low. At 100 and 150 mg/m², mortality of wild An. gambiae s.l. ranged between 55% and 73%. Monthly cone bioassay mortality remained >80% up to 9 months. Conclusions: VECTRON™ shows great potential as IRS formulation for malaria vector control. It can be added to the arsenal of IRS products for use in rotations to control malaria and manage mosquito insecticide resistance.
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12
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Hernandez HM, Martinez FA, Vitek CJ. Insecticide Resistance in Aedes aegypti Varies Seasonally and Geographically in Texas/Mexico Border Cities. JOURNAL OF THE AMERICAN MOSQUITO CONTROL ASSOCIATION 2022; 38:59-69. [PMID: 35276730 DOI: 10.2987/21-21-7034] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Insecticide use is the primary method of attempting to reduce or control the spread of mosquito-borne diseases. Insecticide resistance is a major concern as resistance will limit the efficacy of vector-control efforts. The lower Rio Grande Valley region of South Texas has had autochthonous transmission of multiple mosquito-borne diseases including those caused by dengue virus, chikungunya virus, and Zika virus. However, the current status of mosquito resistance to commonly used pesticides in this region is unknown. In this study, we collected field samples from multiple municipalities in South Texas and assessed resistance using the Centers for Disease Control and Prevention bottle bioassay. All populations exhibited characteristics of resistance, and permethrin was the most effective insecticide with an average mortality rate of 44.78%. Deltamethrin and sumethrin had significantly lower mortality rates of 20.31% and 32.16%, respectively, although neither of these insecticides are commonly used for vector-control activities in this region. Depending on which insecticide was used, there was little significance between each of the 7 cities. Seasonal variation in resistance was observed among the collection sites. Both deltamethrin and sumethrin exhibited an increase in susceptibility over the course of 10 months, while permethrin exhibited a decrease in susceptibility. These data highlight the need for further studies to determine if variations in resistance observed are repeated. The data and future findings may be useful in determining the most effective strategies for pesticide use and rotation.
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Affiliation(s)
- Heather M Hernandez
- University of Texas Rio Grande Valley, Center for Vector-Borne Diseases, 1201 W University Drive, Edinburg, Texas 78539
| | - Flor A Martinez
- University of Texas Rio Grande Valley, Center for Vector-Borne Diseases, 1201 W University Drive, Edinburg, Texas 78539
| | - Christopher J Vitek
- University of Texas Rio Grande Valley, Center for Vector-Borne Diseases, 1201 W University Drive, Edinburg, Texas 78539
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13
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Sympatric Populations of the Anopheles gambiae Complex in Southwest Burkina Faso Evolve Multiple Diverse Resistance Mechanisms in Response to Intense Selection Pressure with Pyrethroids. INSECTS 2022; 13:insects13030247. [PMID: 35323544 PMCID: PMC8955173 DOI: 10.3390/insects13030247] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Revised: 02/16/2022] [Accepted: 02/21/2022] [Indexed: 02/01/2023]
Abstract
Simple Summary Targeting mosquitoes with insecticides is one of the most effective methods to prevent malaria transmission. Although numbers of malaria cases have declined substantially this century, this pattern is not universal and Burkina Faso has one of the highest burdens of malaria; it is also a hotspot for the evolution of insecticide resistance in malaria vectors. We have established laboratory colonies from multiple species within the An. gambiae complex, the most efficient group of malaria vectors in the world, from larval collections in southwest Burkina Faso. Using bioassays with different insecticides widely used to control public health pests, we provide a profile of insecticide resistance in each of these colonies and, using molecular tools, reveal the genetic changes underpinning this resistance. We show that, whilst many resistance mechanisms are shared between species, there are some important differences which may affect resistance to current and future insecticide classes. The complexity, and diversity of resistance mechanisms highlights the importance of screening any potential new insecticide intended for use in malaria control against a wide range of populations. These stable laboratory colonies provide a valuable resource for insecticide discovery, and for further studies on the evolution and dispersal of insecticide resistance within and between species. Abstract Pyrethroid resistance in the Anopheles vectors of malaria is driving an urgent search for new insecticides that can be used in proven vector control tools such as insecticide treated nets (ITNs). Screening for potential new insecticides requires access to stable colonies of the predominant vector species that contain the major pyrethroid resistance mechanisms circulating in wild populations. Southwest Burkina Faso is an apparent hotspot for the emergence of pyrethroid resistance in species of the Anopheles gambiae complex. We established stable colonies from larval collections across this region and characterised the resistance phenotype and underpinning genetic mechanisms. Three additional colonies were successfully established (1 An. coluzzii, 1 An. gambiae and 1 An. arabiensis) to add to the 2 An. coluzzii colonies already established from this region; all 5 strains are highly resistant to pyrethroids. Synergism assays found that piperonyl butoxide (PBO) exposure was unable to fully restore susceptibility although exposure to a commercial ITN containing PBO resulted in 100% mortality. All colonies contained resistant alleles of the voltage gated sodium channel but with differing proportions of alternative resistant haplotypes. RNAseq data confirmed the role of P450s, with CYP6P3 and CYP6Z2 elevated in all 5 strains, and identified many other resistance mechanisms, some found across strains, others unique to a particular species. These strains represent an important resource for insecticide discovery and provide further insights into the complex genetic changes driving pyrethroid resistance.
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14
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Nignan C, Poda BS, Sawadogo SP, Maïga H, Dabiré KR, Gnankine O, Tripet F, Roux O, Diabaté A. Local adaptation and colonization are potential factors affecting sexual competitiveness and mating choice in Anopheles coluzzii populations. Sci Rep 2022; 12:636. [PMID: 35022496 PMCID: PMC8755725 DOI: 10.1038/s41598-021-04704-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2021] [Accepted: 12/24/2021] [Indexed: 11/16/2022] Open
Abstract
The mating behaviour of the malaria vector Anopheles gambiae complex is an important aspect of its reproduction biology. The success of mosquito release programmes based on genetic control of malaria crucially depends on competitive mating between both laboratory-reared and wild individuals, and populations from different localities. It is known that intrinsic and extrinsic factors can influence the mating success. This study addressed some of the knowledge gaps about factors influcencing mosquito mating success. In semi-field conditions, the study compared the mating success of three laboratory-reared and wild allopatric An. coluzzii populations originating from ecologically different locations in Burkina Faso. Overall, it was found that colonization reduced the mating competitiveness of both males and females compared to that of wild type individuals. More importly, females were more likely to mate with males of their own population of origin, be it wild or colonised, suggesting that local adaptation affected mate choice. The observations of mating behaviour of colonized and local wild populations revealed that subtle differences in behaviour lead to significant levels of population-specific mating. This is the first study to highlight the importance of local adaptation in the mating success, thereby highlighting the importance of using local strains for mass-rearing and release of An. coluzzii in vector control programmes.
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Affiliation(s)
- Charles Nignan
- Institut de Recherche en Sciences de La Santé (IRSS), Bobo-Dioulasso, Burkina Faso.
- Laboratoire d'Entomologie Fondamentale Et Appliquée, Unité de Formation Et de Recherche en Sciences de La Vie Et de La Terre (UFR-SVT), Université Ouaga I Pr. Joseph KI-ZERBO, Ouagadougou, Burkina Faso.
| | - Bèwadéyir Serge Poda
- Institut de Recherche en Sciences de La Santé (IRSS), Bobo-Dioulasso, Burkina Faso
- Laboratoire d'Entomologie Fondamentale Et Appliquée, Unité de Formation Et de Recherche en Sciences de La Vie Et de La Terre (UFR-SVT), Université Ouaga I Pr. Joseph KI-ZERBO, Ouagadougou, Burkina Faso
- MIVEGEC, IRD, CNRS, University of Montpellier, Montpellier, France
| | | | - Hamidou Maïga
- Institut de Recherche en Sciences de La Santé (IRSS), Bobo-Dioulasso, Burkina Faso
| | - Kounbobr Roch Dabiré
- Institut de Recherche en Sciences de La Santé (IRSS), Bobo-Dioulasso, Burkina Faso
| | - Olivier Gnankine
- Laboratoire d'Entomologie Fondamentale Et Appliquée, Unité de Formation Et de Recherche en Sciences de La Vie Et de La Terre (UFR-SVT), Université Ouaga I Pr. Joseph KI-ZERBO, Ouagadougou, Burkina Faso
| | - Frédéric Tripet
- Centre for Applied Entomology and Parasitology, School of Life Sciences, Keele University, Keele, UK
| | - Olivier Roux
- Institut de Recherche en Sciences de La Santé (IRSS), Bobo-Dioulasso, Burkina Faso
- MIVEGEC, IRD, CNRS, University of Montpellier, Montpellier, France
| | - Abdoulaye Diabaté
- Institut de Recherche en Sciences de La Santé (IRSS), Bobo-Dioulasso, Burkina Faso
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15
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Kefi M, Charamis J, Balabanidou V, Ioannidis P, Ranson H, Ingham VA, Vontas J. Transcriptomic analysis of resistance and short-term induction response to pyrethroids, in Anopheles coluzzii legs. BMC Genomics 2021; 22:891. [PMID: 34903168 PMCID: PMC8667434 DOI: 10.1186/s12864-021-08205-w] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Accepted: 11/10/2021] [Indexed: 12/21/2022] Open
Abstract
BACKGROUND Insecticide-treated bed nets and indoor residual spraying comprise the major control measures against Anopheles gambiae sl, the dominant vector in sub-Saharan Africa. The primary site of contact with insecticide is through the mosquitoes' legs, which represents the first barrier insecticides have to bypass to reach their neuronal targets. Proteomic changes and leg cuticle modifications have been associated with insecticide resistance that may reduce the rate of penetration of insecticides. Here, we performed a multiple transcriptomic analyses focusing on An. coluzzii legs. RESULTS Firstly, leg-specific enrichment analysis identified 359 genes including the pyrethroid-binder SAP2 and 2 other chemosensory proteins, along with 4 ABCG transporters previously shown to be leg enriched. Enrichment of gene families included those involved in detecting chemical stimuli, including gustatory and ionotropic receptors and genes implicated in hydrocarbon-synthesis. Subsequently, we compared transcript expression in the legs of a highly resistant strain (VK7-HR) to both a strain with very similar genetic background which has reverted to susceptibility after several generations without insecticide pressure (VK7-LR) and a lab susceptible population (NG). Two hundred thirty-two differentially expressed genes (73 up-regulated and 159 down-regulated) were identified in the resistant strain when compared to the two susceptible counterparts, indicating an over-expression of phase I detoxification enzymes and cuticular proteins, with decrease in hormone-related metabolic processes in legs from the insecticide resistant population. Finally, we analysed the short-term effect of pyrethroid exposure on An. coluzzii legs, comparing legs of 1 h-deltamethrin-exposed An. coluzzii (VK7-IN) to those of unexposed mosquitoes (VK7-HR) and identified 348 up-regulated genes including those encoding for GPCRs, ABC transporters, odorant-binding proteins and members of the divergent salivary gland protein family. CONCLUSIONS The data on An. coluzzii leg-specific transcriptome provides valuable insights into the first line of defense in pyrethroid resistant and short-term deltamethrin-exposed mosquitoes. Our results suggest that xenobiotic detoxification is likely occurring in legs, while the enrichment of sensory proteins, ABCG transporters and cuticular genes is also evident. Constitutive resistance is primarily associated with elevated levels of detoxification and cuticular genes, while short-term insecticide-induced tolerance is linked with overexpression of transporters, GPCRs and GPCR-related genes, sensory/binding and salivary gland proteins.
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Affiliation(s)
- M Kefi
- Department of Biology, University of Crete, Vassilika Vouton, 71409, Heraklion, Greece
- Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology-Hellas, 73100, Heraklion, Greece
| | - J Charamis
- Department of Biology, University of Crete, Vassilika Vouton, 71409, Heraklion, Greece
- Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology-Hellas, 73100, Heraklion, Greece
| | - V Balabanidou
- Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology-Hellas, 73100, Heraklion, Greece
| | - P Ioannidis
- Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology-Hellas, 73100, Heraklion, Greece
| | - H Ranson
- Department of Vector Biology, Liverpool School of Tropical Medicine, Pembroke Place, Liverpool, UK
| | - V A Ingham
- Department of Vector Biology, Liverpool School of Tropical Medicine, Pembroke Place, Liverpool, UK
- Parasitology Unit, Universitätsklinikum Heidelberg, Im Neuenheimer Feld 324, 69120, Heidelberg, Germany
| | - J Vontas
- Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology-Hellas, 73100, Heraklion, Greece.
- Pesticide Science Laboratory, Department of Crop Science, Agricultural University of Athens, 11855, Athens, Greece.
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16
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Jin L, Niu G, Guan L, Ramelow J, Zhan Z, Zhou X, Li J. Discovery of mosquitocides from fungal extracts through a high-throughput cytotoxicity-screening approach. Parasit Vectors 2021; 14:595. [PMID: 34863250 PMCID: PMC8643003 DOI: 10.1186/s13071-021-05089-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2021] [Accepted: 11/08/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Mosquitoes transmit a variety of diseases. Due to widespread insecticide resistance, new effective pesticides are urgently needed. Entomopathogenic fungi are widely utilized to control pest insects in agriculture. We hypothesized that certain fungal metabolites may be effective insecticides against mosquitoes. METHODS A high-throughput cytotoxicity-based screening approach was developed to search for insecticidal compounds in our newly established global fungal extract library. We first determined cell survival rates after adding various fungal extracts. Candidate insecticides were further analyzed using traditional larval and adult survival bioassays. RESULTS Twelve ethyl acetate extracts from a total of 192 fungal extracts displayed > 85% inhibition of cabbage looper ovary cell proliferation. Ten of these 12 candidates were confirmed to be toxic to Anopheles gambiae Sua5B cell line, and six showed > 85% inhibition of Anopheles mosquito cell growth. Further bioassays determined a LC50, the lethal concentration that kills 50% of larval or adult mosquitoes, of 122 µg/mL and 1.7 µg/mosquito, respectively, after 24 h for extract 76F6 from Penicillium toxicarium. CONCLUSIONS We established a high-throughput MTT-based cytotoxicity screening approach for the discovery of new mosquitocides from fungal extracts. We discovered a candidate extract from P. toxicarium that exhibited high toxicity to mosquito larvae and adults, and thus were able to demonstrate the value of our recently developed approach. The active fungal extracts discovered here are ideal candidates for further development as mosquitocides.
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Affiliation(s)
- Liang Jin
- Department of Biological Sciences, Florida International University, Miami, FL, 33199, USA.
- Institute of Microbiology, Jiangxi Academy of Sciences, Nanchang, Jiangxi, China.
| | - Guodong Niu
- Department of Biological Sciences, Florida International University, Miami, FL, 33199, USA
- Biomolecular Sciences Institute, Florida International University, Miami, FL, 33199, USA
| | - Limei Guan
- Institute of Microbiology, Jiangxi Academy of Sciences, Nanchang, Jiangxi, China
| | - Julian Ramelow
- Herbert Wertheim College of Medicine, Florida International University, Miami, FL, 33199, USA
| | - Zhigao Zhan
- Institute of Microbiology, Jiangxi Academy of Sciences, Nanchang, Jiangxi, China
| | - Xi Zhou
- Institute of Microbiology, Jiangxi Academy of Sciences, Nanchang, Jiangxi, China
- Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan, 430071, Hubei, China
| | - Jun Li
- Department of Biological Sciences, Florida International University, Miami, FL, 33199, USA.
- Biomolecular Sciences Institute, Florida International University, Miami, FL, 33199, USA.
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17
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Hien AS, Soma DD, Maiga S, Coulibaly D, Diabaté A, Belemvire A, Diouf MB, Jacob D, Koné A, Dotson E, Awolola TS, Oxborough RM, Dabiré RK. Evidence supporting deployment of next generation insecticide treated nets in Burkina Faso: bioassays with either chlorfenapyr or piperonyl butoxide increase mortality of pyrethroid-resistant Anopheles gambiae. Malar J 2021; 20:406. [PMID: 34663348 PMCID: PMC8524873 DOI: 10.1186/s12936-021-03936-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Accepted: 09/30/2021] [Indexed: 12/04/2022] Open
Abstract
BACKGROUND Pyrethroid resistance poses a major threat to the efficacy of insecticide-treated nets (ITNs) in Burkina Faso and throughout sub-Saharan Africa, particularly where resistance is present at high intensity. For such areas, there are alternative ITNs available, including the synergist piperonyl butoxide (PBO)-based ITNs and dual active ingredient ITNs such as Interceptor G2 (treated with chlorfenapyr and alpha-cypermethrin). Before deploying alternative ITNs on a large scale it is crucial to characterize the resistance profiles of primary malaria vector species for evidence-based decision making. METHODS Larvae from the predominant vector, Anopheles gambiae sensu lato (s.l.) were collected from 15 sites located throughout Burkina Faso and reared to adults for bioassays to assess insecticide resistance status. Resistance intensity assays were conducted using WHO tube tests to determine the level of resistance to pyrethroids commonly used on ITNs at 1×, 5 × and 10 × times the diagnostic dose. WHO tube tests were also used for PBO synergist bioassays with deltamethrin and permethrin. Bottle bioassays were conducted to determine susceptibility to chlorfenapyr at a dose of 100 µg/bottle. RESULTS WHO tube tests revealed high intensity resistance in An. gambiae s.l. to deltamethrin and alpha-cypermethrin in all sites tested. Resistance intensity to permethrin was either moderate or high in 13 sites. PBO pre-exposure followed by deltamethrin restored full susceptibility in one site and partially restored susceptibility in all but one of the remaining sites (often reaching mortality greater than 80%). PBO pre-exposure followed by permethrin partially restored susceptibility in 12 sites. There was no significant increase in permethrin mortality after PBO pre-exposure in Kampti, Karangasso-Vigué or Mangodara; while in Seguenega, Orodara and Bobo-Dioulasso there was a significant increase in mortality, but rates remained below 50%. Susceptibility to chlorfenapyr was confirmed in 14 sites. CONCLUSION High pyrethroid resistance intensity in An. gambiae s.l. is widespread across Burkina Faso and may be a predictor of reduced pyrethroid ITN effectiveness. PBO + deltamethrin ITNs would likely provide greater control than pyrethroid nets. However, since susceptibility in bioassays was not restored in most sites following pre-exposure to PBO, Interceptor G2 may be a better long-term solution as susceptibility was recorded to chlorfenapyr in nearly all sites. This study provides evidence supporting the introduction of both Interceptor G2 nets and PBO nets, which were distributed in Burkina Faso in 2019 as part of a mass campaign.
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Affiliation(s)
- Aristide S Hien
- Institut de Recherche en Sciences de La Santé (IRSS), Bobo-Dioulasso, Burkina Faso
| | - Dieudonné D Soma
- Institut de Recherche en Sciences de La Santé (IRSS), Bobo-Dioulasso, Burkina Faso
| | - Samina Maiga
- Institut de Recherche en Sciences de La Santé (IRSS), Bobo-Dioulasso, Burkina Faso
| | - Dramane Coulibaly
- Institut de Recherche en Sciences de La Santé (IRSS), Bobo-Dioulasso, Burkina Faso
| | - Abdoulaye Diabaté
- Institut de Recherche en Sciences de La Santé (IRSS), Bobo-Dioulasso, Burkina Faso
| | - Allison Belemvire
- U.S. President's Malaria Initiative, U.S. Agency for International Development, Washington, DC, USA
| | - Mame B Diouf
- U.S. President's Malaria Initiative, US Embassy Ouagadougou, Ouagadougou, Burkina Faso
| | - Djenam Jacob
- PMI VectorLink Project, Abt Associates Inc, 6130 Executive Blvd, Rockville, MD, 20852, USA
| | - Adama Koné
- PMI VectorLink Burkina Faso, Abt Associates Inc, Ouagadougou, Burkina Faso
| | - Ellen Dotson
- Division of Parasitic Diseases and Malaria, Center for Global Health, Centers for Disease Control and Prevention, Atlanta, GA, 30333, USA
| | - Taiwo S Awolola
- Division of Parasitic Diseases and Malaria, Center for Global Health, Centers for Disease Control and Prevention, Atlanta, GA, 30333, USA
- Centers for Disease Control and Prevention, U.S. President's Malaria Initiative, Atlanta, GA, USA
| | - Richard M Oxborough
- PMI VectorLink Project, Abt Associates Inc, 6130 Executive Blvd, Rockville, MD, 20852, USA
| | - Roch K Dabiré
- Institut de Recherche en Sciences de La Santé (IRSS), Bobo-Dioulasso, Burkina Faso.
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18
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Metabolic Resistance in Permethrin-Resistant Florida Aedes aegypti (Diptera: Culicidae). INSECTS 2021; 12:insects12100866. [PMID: 34680634 PMCID: PMC8540271 DOI: 10.3390/insects12100866] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Revised: 09/14/2021] [Accepted: 09/20/2021] [Indexed: 11/19/2022]
Abstract
Simple Summary Pyrethroid-oriented vector control programs have increased worldwide to control adult Aedes aegypti mosquitoes and quell Aedes-borne disease epidemics. Due to years of pyrethroid use, resistance to pyrethroids in Ae. aegypti has become a global issue. In Florida, permethrin is the most common pyrethroid adulticide active ingredient used to control mosquito populations. Thus far, all wild Florida Ae. aegypti populations tested against permethrin have been found to be resistant. Metabolic resistance is a major mechanism of resistance in insects in which enzyme-mediated reactions cause the degradation or sequestration of insecticides. We performed assays to investigate the presence of metabolic resistance in 20 Florida Ae. aegypti populations and found that 11 populations (55%) exhibited metabolic resistance due to the action of at least one of three classes of metabolizing enzymes: oxidases, esterases, and glutathione transferases. Additionally, we identified two metabolic enzyme inhibitors: S.S.S-tributyl phosphorotrithioate (DEF; inhibits esterase activity) and diethyl maleate (DM; inhibits glutathione transferase activity), in addition to the commonly used piperonyl butoxide (PBO; inhibits oxidase activity), which were able to increase the efficacy of permethrin against resistant Ae. aegypti populations. Pre-exposure to DEF, PBO, and DM resulted in increased mortality after permethrin exposure in eight (73%), seven (64%), and six (55%) of the Ae. aegypti populations, respectively. Increasing the effectiveness of pyrethroids is important for mosquito control, as it is the primary method used for adult control during mosquito-borne disease outbreaks. Considering that DEF and DM performed similarly to PBO, they may be good candidates for inclusion in formulated pyrethroid products to increase their efficacy against resistant mosquitoes. Abstract Aedes aegypti is the principal mosquito vector for many arthropod-borne viruses (arboviruses) including dengue, chikungunya, and Zika. In the United States, excessive permethrin use has led to a high frequency of resistance in mosquitoes. Insecticide resistance is a significant obstacle in the struggle against vector-borne diseases. To help overcome metabolic resistance, synergists that inhibit specific metabolic enzymes can be added to formulated pyrethroid products. Using modified CDC bottle bioassays, we assessed the effect of three inhibitors (piperonyl butoxide (PBO), which inhibits oxidase activity; S.S.S-tributyl phosphorotrithioate (DEF), which inhibits esterase activity; and diethyl maleate (DM), which inhibits glutathione transferase activity) + permethrin. We performed these against 20 Florida Ae. aegypti populations, all of which were resistant to permethrin. Our data indicated that 11 out of 20 populations (55%) exhibited metabolic resistance. Results revealed 73% of these populations had significant increases in mortality attributed to DEF + permethrin, 64% to PBO + permethrin, and 55% to DM + permethrin compared to permethrin alone. Currently, PBO is the only metabolic enzyme inhibitor added to formulated pyrethroid products used for adult mosquito control. Our results suggest that the DEF and DM inhibitors could also be useful additives in permethrin products, especially against metabolically resistant Ae. aegypti mosquitoes. Moreover, metabolic assays should be conducted to better inform mosquito control programs for designing and implementing integrated vector management strategies.
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19
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N'Do S, Bandibabone JB, Soma DD, Musaka BZ, Prudhomme J, Habamungu CC, Namountougou M, Sangaré I, Kientega M, Kaboré DAP, Bayili K, Yerbanga RS, Diabate A, Dabire RK, Ouedraogo JB, Belem AMG, Boëte C, Guardiola-Claramonte M, Chimanuka B. Insecticide resistance profiles in malaria vector populations from Sud-Kivu in the Democratic Republic of the Congo. Trans R Soc Trop Med Hyg 2021; 115:1339-1344. [PMID: 34324683 DOI: 10.1093/trstmh/trab116] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Revised: 07/02/2021] [Accepted: 07/14/2021] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Insecticide resistance has become a widespread problem causing a decline in the effectiveness of vector control tools in sub-Saharan Africa. In this situation, ongoing monitoring of vector susceptibility to insecticides is encouraged by the WHO to guide national malaria control programmes. Our study was conducted from April to November 2018 in Tchonka (Sud-Kivu, Democratic Republic of the Congo) and reported primary data on the resistance status of Anopheles funestus and Anopheles gambiae. METHODS Insecticide susceptibility bioassays were performed on wild populations of A. funestus and A. gambiae using WHO insecticide-impregnated papers at discriminating concentration. In addition, PCR was performed to identify mosquito species and to detect kdr and ace-1R mutations involved in insecticide resistance. RESULTS Bioassay results show resistance to all tested insecticides except pirimiphos-methyl, propoxur, fenitrothion and malathion with a mortality rate ranging from 95.48 to 99.86%. The addition of piperonyl butoxide (PBO) increased the susceptibility of vectors to deltamethrin and alpha-cypermethrin by exhibiting a mortality ranging from 91.50 to 95.86%. The kdr mutation was detected at high frequencies (approximately 0.98) within A. gambiae while ace-1R was not detected. CONCLUSIONS This study provides useful data on the insecticide resistance profiles of malaria vector populations to better manage vector control. Our results highlight that, despite the high level of resistance, organophosphorus compounds and pyrethroids + PBO remain effective against the vectors.
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Affiliation(s)
- Sévérin N'Do
- Médecins Sans Frontières (MSF) OCBA, Barcelona, Spain.,Institut de Recherche en Sciences de la Santé (IRSS), Bobo-Dioulasso, Burkina Faso.,Université Nazi Boni (UNB), Bobo-Dioulasso, Burkina Faso
| | - Janvier B Bandibabone
- Centre de Recherche en Sciences Naturelles de Lwiro (CRSN/Lwiro), Bukavu, Sud-Kivu, DRC
| | - Dieudonné D Soma
- Institut de Recherche en Sciences de la Santé (IRSS), Bobo-Dioulasso, Burkina Faso.,Université Nazi Boni (UNB), Bobo-Dioulasso, Burkina Faso
| | - Bertin Z Musaka
- Centre de Recherche en Sciences Naturelles de Lwiro (CRSN/Lwiro), Bukavu, Sud-Kivu, DRC
| | - Jorian Prudhomme
- Médecins Sans Frontières (MSF) OCBA, Barcelona, Spain.,Institut de Recherche pour le Développement (IRD), Marseille, France
| | - Claude C Habamungu
- Centre de Recherche en Sciences Naturelles de Lwiro (CRSN/Lwiro), Bukavu, Sud-Kivu, DRC
| | - Moussa Namountougou
- Institut de Recherche en Sciences de la Santé (IRSS), Bobo-Dioulasso, Burkina Faso.,Université Nazi Boni (UNB), Bobo-Dioulasso, Burkina Faso
| | - Ibrahim Sangaré
- Institut de Recherche en Sciences de la Santé (IRSS), Bobo-Dioulasso, Burkina Faso.,Université Nazi Boni (UNB), Bobo-Dioulasso, Burkina Faso
| | - Mahamadi Kientega
- Institut de Recherche en Sciences de la Santé (IRSS), Bobo-Dioulasso, Burkina Faso.,Université Nazi Boni (UNB), Bobo-Dioulasso, Burkina Faso
| | - Didier A P Kaboré
- Institut de Recherche en Sciences de la Santé (IRSS), Bobo-Dioulasso, Burkina Faso.,Université Nazi Boni (UNB), Bobo-Dioulasso, Burkina Faso
| | - Koama Bayili
- Institut de Recherche en Sciences de la Santé (IRSS), Bobo-Dioulasso, Burkina Faso
| | - R Serge Yerbanga
- Institut de Recherche en Sciences de la Santé (IRSS), Bobo-Dioulasso, Burkina Faso
| | - Abdoulaye Diabate
- Institut de Recherche en Sciences de la Santé (IRSS), Bobo-Dioulasso, Burkina Faso
| | - Roch K Dabire
- Institut de Recherche en Sciences de la Santé (IRSS), Bobo-Dioulasso, Burkina Faso
| | - Jean-Bosco Ouedraogo
- Institut de Recherche en Sciences de la Santé (IRSS), Bobo-Dioulasso, Burkina Faso
| | | | - Christophe Boëte
- Médecins Sans Frontières (MSF) OCBA, Barcelona, Spain.,ISEM, Université de Montpellier, CNRS, IRD, EPHE, Montpellier, France
| | | | - Bantuzeko Chimanuka
- Centre de Recherche en Sciences Naturelles de Lwiro (CRSN/Lwiro), Bukavu, Sud-Kivu, DRC.,Université Officielle de Bukavu (UOB), Bukavu, Sud-Kivu, DRC
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20
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Yaméogo KB, Yerbanga RS, Ouattara SB, Yao FA, Lefèvre T, Zongo I, Nikièma F, Compaoré YD, Tinto H, Chandramohan D, Greenwood B, Belem AMG, Cohuet A, Ouédraogo JB. Effect of seasonal malaria chemoprevention plus azithromycin on Plasmodium falciparum transmission: gametocyte infectivity and mosquito fitness. Malar J 2021; 20:326. [PMID: 34315475 PMCID: PMC8314489 DOI: 10.1186/s12936-021-03855-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Accepted: 07/16/2021] [Indexed: 11/24/2022] Open
Abstract
Background Seasonal malaria chemoprevention (SMC) consists of administration of sulfadoxine-pyrimethamine (SP) + amodiaquine (AQ) at monthly intervals to children during the malaria transmission period. Whether the addition of azithromycin (AZ) to SMC could potentiate the benefit of the intervention was tested through a double-blind, randomized, placebo-controlled trial. The effect of SMC and the addition of AZ, on malaria transmission and on the life history traits of Anopheles gambiae mosquitoes have been investigated. Methods The study included 438 children randomly selected from among participants in the SMC + AZ trial and 198 children from the same area who did not receive chemoprevention. For each participant in the SMC + AZ trial, blood was collected 14 to 21 days post treatment, examined for the presence of malaria sexual and asexual stages and provided as a blood meal to An. gambiae females using a direct membrane-feeding assay. Results The SMC treatment, with or without AZ, significantly reduced the prevalence of asexual Plasmodium falciparum (LRT X22 = 69, P < 0.0001) and the gametocyte prevalence (LRT X22 = 54, P < 0.0001). In addition, the proportion of infectious feeds (LRT X22 = 61, P < 0.0001) and the prevalence of oocysts among exposed mosquitoes (LRT X22 = 22.8, P < 0.001) was reduced when mosquitoes were fed on blood from treated children compared to untreated controls. The addition of AZ to SPAQ was associated with an increased proportion of infectious feeds (LRT X21 = 5.2, P = 0.02), suggesting a significant effect of AZ on gametocyte infectivity. There was a slight negative effect of SPAQ and SPAQ + AZ on mosquito survival compared to mosquitoes fed with blood from control children (LRTX22 = 330, P < 0.0001). Conclusion This study demonstrates that SMC may contribute to a reduction in human to mosquito transmission of P. falciparum, and the reduced mosquito longevity observed for females fed on treated blood may increase the benefit of this intervention in control of malaria. The addition of AZ to SPAQ in SMC appeared to enhance the infectivity of gametocytes providing further evidence that this combination is not an appropriate intervention.
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Affiliation(s)
- Koudraogo Bienvenue Yaméogo
- Institut de Recherche en Sciences de la Santé, Bobo-Dioulasso, Burkina Faso. .,Université Nazi Boni, Bobo-Dioulasso, Burkina Faso.
| | - Rakiswendé Serge Yerbanga
- Institut de Recherche en Sciences de la Santé, Bobo-Dioulasso, Burkina Faso.,Institut des Sciences et Techniques (INSTech Bobo), BP2779, Bobo-Dioulasso, Burkina Faso
| | | | - Franck A Yao
- Institut de Recherche en Sciences de la Santé, Bobo-Dioulasso, Burkina Faso
| | - Thierry Lefèvre
- Institut de Recherche en Sciences de la Santé, Bobo-Dioulasso, Burkina Faso.,MIVEGEC, University of Montpellier, IRD, CNRS, Montpellier, France.,Laboratoire Mixte International Sur Les Vecteurs (LAMIVECT), Bobo Dioulasso, Burkina Faso.,Centre de Recherche en Écologie et Évolution de la Santé (CREES), Montpellier, France
| | - Issaka Zongo
- Institut de Recherche en Sciences de la Santé, Bobo-Dioulasso, Burkina Faso
| | - Frederic Nikièma
- Institut de Recherche en Sciences de la Santé, Bobo-Dioulasso, Burkina Faso
| | | | - Halidou Tinto
- Institut de Recherche en Sciences de la Santé, Nanoro, Burkina Faso
| | | | | | | | - Anna Cohuet
- MIVEGEC, University of Montpellier, IRD, CNRS, Montpellier, France.,Laboratoire Mixte International Sur Les Vecteurs (LAMIVECT), Bobo Dioulasso, Burkina Faso
| | - Jean Bosco Ouédraogo
- Institut de Recherche en Sciences de la Santé, Bobo-Dioulasso, Burkina Faso.,Institut des Sciences et Techniques (INSTech Bobo), BP2779, Bobo-Dioulasso, Burkina Faso
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21
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Zhang H, Li M, Tan R, Deng C, Huang B, Wu Z, Zheng S, Guo W, Tuo F, Yuan Y, Bandeira CA, Rompão DH, Xu Q, Song J, Wang Q. Presence of L1014F Knockdown-Resistance Mutation in Anopheles gambiae s.s. From São Tomé and Príncipe. Front Cell Infect Microbiol 2021; 11:633905. [PMID: 34307185 PMCID: PMC8295031 DOI: 10.3389/fcimb.2021.633905] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Accepted: 06/08/2021] [Indexed: 11/18/2022] Open
Abstract
Malaria, one of the most serious parasitic diseases, kills thousands of people every year, especially in Africa. São Tomé and Príncipe are known to have stable transmission of malaria. Indoor residual spraying (IRS) of insecticides and long-lasting insecticidal nets (LLIN) are considered as an effective malaria control interventions in these places. The resistance status of Anopheles gambiae s.s. from Agua Grande, Caue, and Lemba of São Tomé and Príncipe to insecticides, such as dichlorodiphenyltrichloroethane (DDT) (4.0%), deltamethrin (0.05%), permethrin (0.75%), fenitrothion (1.0%), and malathion (5.0%), were tested according to the WHO standard protocol. DNA extraction, species identification, as well as kdr and ace-1R genotyping were done with the surviving and dead mosquitoes post testing. They showed resistance to cypermethrin with mortality rates ranging from 89.06% to 89.66%. Mosquitoes collected from Agua Grande, Caue, and Lemba displayed resistance to DDT and fenitrothion with mortality rates higher than 90%. No other species were detected in these study localities other than Anopheles gambiae s.s. The frequency of L1014F was high in the three investigated sites, which was detected for the first time in São Tomé and Príncipe. No ace-1R mutation was detected in all investigated sites. The high frequency of L1014F showed that kdr L1014F mutation might be related to insecticide resistance to Anopheles gambiae s.s. populations from São Tomé and Príncipe. Insecticide resistance status is alarming and, therefore, future malaria vector management should be seriously considered by the government of São Tomé and Príncipe.
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Affiliation(s)
- Hongying Zhang
- Artemisinin Research Center, Guangzhou University of Chinese Medicine, Guangzhou, China.,Science and Technology Institute, Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Mingqiang Li
- Artemisinin Research Center, Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Ruixiang Tan
- Artemisinin Research Center, Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Changsheng Deng
- Artemisinin Research Center, Guangzhou University of Chinese Medicine, Guangzhou, China.,The Ministry of Health, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Bo Huang
- Science and Technology Institute, Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Zhibin Wu
- The Ministry of Health, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Shaoqing Zheng
- Science and Technology Institute, Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Wenfeng Guo
- Artemisinin Research Center, Guangzhou University of Chinese Medicine, Guangzhou, China.,The Ministry of Health, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Fei Tuo
- Artemisinin Research Center, Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Yueming Yuan
- Science and Technology Institute, Guangzhou University of Chinese Medicine, Guangzhou, China
| | | | | | - Qin Xu
- Artemisinin Research Center, Guangzhou University of Chinese Medicine, Guangzhou, China.,The Ministry of Health, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Jianping Song
- Artemisinin Research Center, Guangzhou University of Chinese Medicine, Guangzhou, China.,The Ministry of Health, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Qi Wang
- Artemisinin Research Center, Guangzhou University of Chinese Medicine, Guangzhou, China.,The Ministry of Health, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China
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22
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Ingham VA, Brown F, Ranson H. Transcriptomic analysis reveals pronounced changes in gene expression due to sub-lethal pyrethroid exposure and ageing in insecticide resistance Anopheles coluzzii. BMC Genomics 2021; 22:337. [PMID: 33971808 PMCID: PMC8111724 DOI: 10.1186/s12864-021-07646-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Accepted: 04/23/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Malaria control is heavily reliant on the use of insecticides that target and kill the adult female Anopheline vector. The intensive use of insecticides of the pyrethroid class has led to widespread resistance in mosquito populations. The intensity of pyrethroid resistance in some settings in Africa means mosquitoes can contact bednets treated with this insecticide class multiple times with minimal mortality effects. Furthermore, both ageing and diel cycle have been shown to have large impacts on the resistance phenotype. Together, these traits may affect other aspects of vector biology controlling the vectorial capacity or fitness of the mosquito. RESULTS Here we show that sublethal exposure of a highly resistant Anopheles coluzzii population originally from Burkina Faso to the pyrethroid deltamethrin results in large and sustained changes to transcript expression. We identify five clear patterns in the data showing changes to transcripts relating to: DNA repair, respiration, translation, behaviour and oxioreductase processes. Further, we highlight differential regulation of transcripts from detoxification families previously linked with insecticide resistance, in addition to clear down-regulation of the oxidative phosphorylation pathway both indicative of changes in metabolism post-exposure. Finally, we show that both ageing and diel cycle have major effects on known insecticide resistance related transcripts. CONCLUSION Sub-lethal pyrethroid exposure, ageing and the diel cycle results in large-scale changes in the transcriptome of the major malaria vector Anopheles coluzzii. Our data strongly supports further phenotypic studies on how transcriptional changes such as reduced expression of the oxidative phosphorylation pathway or pyrethroid induced changes to redox state might impact key mosquito traits, such as vectorial capacity and life history traits.
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Affiliation(s)
- V A Ingham
- Department of Vector Biology, Liverpool School of Tropical Medicine, Liverpool, L35QA, UK. .,Present Address: Parasitology Unit, Centre for Infectious Diseases, Universitätsklinikum, Im Neuenheimer Feld 324, 69120, Heidelberg, Germany.
| | - F Brown
- Department of Vector Biology, Liverpool School of Tropical Medicine, Liverpool, L35QA, UK.,Department of Epidemiology and Population Health, Institute of Infection and Global Health, Faculty of Health and Life Sciences, Leahurst Campus, University of Liverpool, Neston, CH647TE, UK
| | - H Ranson
- Department of Vector Biology, Liverpool School of Tropical Medicine, Liverpool, L35QA, UK
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23
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Keïta M, Sogoba N, Traoré B, Kané F, Coulibaly B, Traoré SF, Doumbia S. Performance of pirimiphos-methyl based Indoor Residual Spraying on entomological parameters of malaria transmission in the pyrethroid resistance region of Koulikoro, Mali. Acta Trop 2021; 216:105820. [PMID: 33400915 PMCID: PMC8008285 DOI: 10.1016/j.actatropica.2020.105820] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Revised: 12/23/2020] [Accepted: 12/24/2020] [Indexed: 11/28/2022]
Abstract
Malaria vector control in Mali relies heavily on the use of long-lasting insecticidal nets (LLINs) and indoor residual spraying (IRS) in selected districts. As part of strengthening vector control strategies in Koulikoro district, the National Malaria Control Programme (NMCP) through the support from the US President's Malaria Initiative (PMI) has strategically driven the implementation of IRS, with the LLINs coverage also rising from 93.3% and 98.2%. Due to the increased reports of vector resistance to both pyrethroid and carbamates, there was a campaign for the use of pirimiphos-methyl, an organophosphate at Koulikoro between 2015 and 2016. In this study, the effect of IRS on malaria transmission was assessed, by comparing some key entomological indices between Koulikoro, where IRS was implemented and its neighboring district, Banamba that has never received IRS as vector control intervention. The study was conducted in two villages of each district (Koulikoro and Banamba). Pyrethrum spray catches and entry window trapping were used to collect mosquitoes on a monthly basis. WHO tube tests were carried out to assess mosquito susceptibility to insecticides. Mosquitoes were identified to species level by PCR and their infection to P. falciparum was detected by Enzyme Linked-Immuno-Sorbent Assay (ELISA). Of the 527 specimens identified, An. coluzzii was the most frequent species (95%) followed by An. gambiae (4%) and An. arabiensis (1%). Its density was rainfall dependent in the no-IRS area, and almost independent in the IRS area. The infection rate (IR) in the no-IRS area was 0.96%, while it was null in the IRS area. In the no-IRS area, the entomological inoculation rate (EIR) was 0.21 infective bites /person month with a peak in September. High resistance to pyrethroids and carbamates and susceptibility to organophosphates was observed at all sites. The introduction of pirimiphos-methyl based IRS for vector control resulted in a significant decrease in malaria transmission. An. gambiae s.l., the main malaria vector in the area, was resistant to pyrethroids and carbamates but remained susceptible to the organophosphate pirimiphos-methyl.
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Affiliation(s)
- Moussa Keïta
- Malaria Research and Training Center/International Center for Excellence in Research (ICER-Mali)/ Faculty of Medicine and Odonto Stomatology/University of Sciences, Techniques and Technologies of Bamako (USTTB) Bamako, Mali.
| | - Nafomon Sogoba
- Malaria Research and Training Center/International Center for Excellence in Research (ICER-Mali)/ Faculty of Medicine and Odonto Stomatology/University of Sciences, Techniques and Technologies of Bamako (USTTB) Bamako, Mali
| | - Boïssé Traoré
- Malaria Research and Training Center/International Center for Excellence in Research (ICER-Mali)/ Faculty of Medicine and Odonto Stomatology/University of Sciences, Techniques and Technologies of Bamako (USTTB) Bamako, Mali
| | - Fousseyni Kané
- Malaria Research and Training Center/International Center for Excellence in Research (ICER-Mali)/ Faculty of Medicine and Odonto Stomatology/University of Sciences, Techniques and Technologies of Bamako (USTTB) Bamako, Mali
| | - Boubacar Coulibaly
- Malaria Research and Training Center/International Center for Excellence in Research (ICER-Mali)/ Faculty of Medicine and Odonto Stomatology/University of Sciences, Techniques and Technologies of Bamako (USTTB) Bamako, Mali
| | - Sekou Fantamady Traoré
- Malaria Research and Training Center/International Center for Excellence in Research (ICER-Mali)/ Faculty of Medicine and Odonto Stomatology/University of Sciences, Techniques and Technologies of Bamako (USTTB) Bamako, Mali
| | - Seydou Doumbia
- Malaria Research and Training Center/International Center for Excellence in Research (ICER-Mali)/ Faculty of Medicine and Odonto Stomatology/University of Sciences, Techniques and Technologies of Bamako (USTTB) Bamako, Mali
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Niu G, Wang X, Hao Y, Kandel S, Niu G, Raptis RG, Li J. A novel fungal metabolite inhibits Plasmodium falciparum transmission and infection. Parasit Vectors 2021; 14:177. [PMID: 33761961 PMCID: PMC7992847 DOI: 10.1186/s13071-021-04677-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2020] [Accepted: 03/09/2021] [Indexed: 02/05/2023] Open
Abstract
Background Malaria transmission depends on infected mosquitoes and can be controlled by transmission-blocking drugs. The recently discovered FREP1-mediated malaria transmission pathway is an excellent target to screen drugs for limiting transmission. Methods To identify candidate small molecules, we used an ELISA-based approach to analyze extracts from a fungal library for inhibition of the FREP1–parasite interaction. We isolated and determined one active compound by chromatography and crystallography, respectively. We measured the effects of the bioactive compound on malaria transmission to mosquitoes through standard membrane-feeding assays (SMFA) and on parasite proliferation in blood by culturing. Results We discovered the ethyl acetate extract of the fungus Purpureocillium lilacinum that inhibited Plasmodium falciparum transmission to mosquitoes. Pre-exposure to the extract rendered Anopheles gambiae resistant to Plasmodium infection. Furthermore, we isolated one novel active compound from the extract and identified it as 3-amino-7,9-dihydroxy-1-methyl-6H-benzo[c]chromen-6-one, or “pulixin.” Pulixin prevented FREP1 from binding to P. falciparum-infected cell lysate. Pulixin blocked the transmission of the parasite to mosquitoes with an EC50 (the concentration that gave half-maximal response) of 11 µM based on SMFA. Notably, pulixin also inhibited the proliferation of asexual-stage P. falciparum with an EC50 of 47 nM. The compound did not show cytotoxic effects at a concentration of 116 µM or lower. Conclusion By targeting the FREP1–Plasmodium interaction, we discovered that Purpureocillium lilacinum extract blocked malaria transmission. We isolated and identified the bioactive agent pulixin as a new compound capable of stopping malaria transmission to mosquitoes and inhibiting parasite proliferation in blood culture.![]() Supplementary Information The online version contains supplementary material available at 10.1186/s13071-021-04677-7.
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Affiliation(s)
- Guodong Niu
- Department of Biological Sciences, Florida International University, 11200 SW 8th St, Miami, FL, 33199, USA
| | - Xiaohong Wang
- Department of Biological Sciences, Florida International University, 11200 SW 8th St, Miami, FL, 33199, USA
| | - Yue Hao
- Department of Biological Sciences, Florida International University, 11200 SW 8th St, Miami, FL, 33199, USA.,College of Public Health, University of South China, Hengyang, Hunan, China
| | - Shambhu Kandel
- Department of Chemistry and Biochemistry, Florida International University, 11200 SW 8th St, Miami, FL, 33199, USA
| | - Guomin Niu
- Department of Hematology, Southern Medical University Affiliated Nanhai Hospital, Guangzhou, Guangdong, China
| | - Raphael G Raptis
- Department of Chemistry and Biochemistry, Florida International University, 11200 SW 8th St, Miami, FL, 33199, USA.,Biomolecular Sciences Institute, Florida International University, 11200 SW 8th St, Miami, FL, 33199, USA
| | - Jun Li
- Department of Biological Sciences, Florida International University, 11200 SW 8th St, Miami, FL, 33199, USA. .,Biomolecular Sciences Institute, Florida International University, 11200 SW 8th St, Miami, FL, 33199, USA.
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Black WC, Snell TK, Saavedra-Rodriguez K, Kading RC, Campbell CL. From Global to Local-New Insights into Features of Pyrethroid Detoxification in Vector Mosquitoes. INSECTS 2021; 12:insects12040276. [PMID: 33804964 PMCID: PMC8063960 DOI: 10.3390/insects12040276] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Revised: 03/18/2021] [Accepted: 03/20/2021] [Indexed: 02/04/2023]
Abstract
The threat of mosquito-borne diseases continues to be a problem for public health in subtropical and tropical regions of the world; in response, there has been increased use of adulticidal insecticides, such as pyrethroids, in human habitation areas over the last thirty years. As a result, the prevalence of pyrethroid-resistant genetic markers in natural mosquito populations has increased at an alarming rate. This review details recent advances in the understanding of specific mechanisms associated with pyrethroid resistance, with emphasis on features of insecticide detoxification and the interdependence of multiple cellular pathways. Together, these advances add important context to the understanding of the processes that are selected in resistant mosquitoes. Specifically, before pyrethroids bind to their targets on motoneurons, they must first permeate the outer cuticle and diffuse to inner tissues. Resistant mosquitoes have evolved detoxification mechanisms that rely on cytochrome P450s (CYP), esterases, carboxyesterases, and other oxidation/reduction (redox) components to effectively detoxify pyrethroids to nontoxic breakdown products that are then excreted. Enhanced resistance mechanisms have evolved to include alteration of gene copy number, transcriptional and post-transcriptional regulation of gene expression, as well as changes to cellular signaling mechanisms. Here, we outline the variety of ways in which detoxification has been selected in various mosquito populations, as well as key gene categories involved. Pathways associated with potential new genes of interest are proposed. Consideration of multiple cellular pathways could provide opportunities for development of new insecticides.
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26
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Hien AS, Soma DD, Somé FA, Namountougou M, Poda SB, Ouédraogo GA, Diabaté A, Dabiré RK. Short Persistence and Vector Susceptibility to Ficam 80WP (bendiocarb active ingredient) During Pilot Application of Indoor Residual Spraying in Burkina Faso, West Africa. JOURNAL OF MEDICAL ENTOMOLOGY 2021; 58:781-786. [PMID: 33164064 DOI: 10.1093/jme/tjaa240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Indexed: 06/11/2023]
Abstract
Indoor residual spraying (IRS) was applied in addition to the use of long-lasting insecticidal nets in the South West in Burkina Faso, where Anopheles gambiae s.l. the major malaria vector was resistant to pyrethroids. This study was designed to evaluate the efficacy and residual life of bendiocarb (active ingredient) used for spraying on different wall surfaces (mud and cement). Cone bioassays were done monthly with the susceptible An. gambiae 'Kisumu' strain and the local wild populations to determine the duration for which insecticide was effective in killing mosquitoes. Cone bioassay data showed low efficacy and short persistence of bendiocarb applied on mud and cement walls, lasting 2 mo with the susceptible insectary strain and less than 1 mo with An. gambiae wild populations. In addition, WHO tube assays confirmed resistance of An. gambiae wild populations to 0.1% bendiocarb with mortality rates less than 80% in both study sites (sprayed and unsprayed sites). The pilot study of IRS with bendiocarb showed that the residual efficacy of bendiocarb was very short, and resistance to bendiocarb was confirmed in wild populations of An. gambiae s.l. Therefore, Ficam 80 WP was not suitable for IRS in this area due to the short residual duration related mainly to vectors resistance to bendiocarb. While waiting for innovative malaria control tool, alternative insecticide (organophosphate or neonicotinoid classes) or combinations of insecticides have to be used for insecticide resistance management in Burkina Faso.
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Affiliation(s)
- Aristide Sawdetuo Hien
- Biomedical and Public Health Department, Institut de Recherche en Sciences de la Santé, Direction Regionale, Avenue de la liberté, 01 BP 545, Bobo-Dioulasso 01, Burkina Faso
| | - Dieudonné Diloma Soma
- Biomedical and Public Health Department, Institut de Recherche en Sciences de la Santé, Direction Regionale, Avenue de la liberté, 01 BP 545, Bobo-Dioulasso 01, Burkina Faso
| | - Fabrice Anyirekun Somé
- Biomedical and Public Health Department, Institut de Recherche en Sciences de la Santé, Direction Regionale, Avenue de la liberté, 01 BP 545, Bobo-Dioulasso 01, Burkina Faso
| | - Moussa Namountougou
- Department of Applied Biology, Université Nazi Boni, 01 BP 1091 Bobo-Dioulasso 01, Burkina Faso
| | - Serge Bèwadéyir Poda
- Biomedical and Public Health Department, Institut de Recherche en Sciences de la Santé, Direction Regionale, Avenue de la liberté, 01 BP 545, Bobo-Dioulasso 01, Burkina Faso
| | | | - Abdoulaye Diabaté
- Biomedical and Public Health Department, Institut de Recherche en Sciences de la Santé, Direction Regionale, Avenue de la liberté, 01 BP 545, Bobo-Dioulasso 01, Burkina Faso
| | - Roch Kounbobr Dabiré
- Biomedical and Public Health Department, Institut de Recherche en Sciences de la Santé, Direction Regionale, Avenue de la liberté, 01 BP 545, Bobo-Dioulasso 01, Burkina Faso
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Dambach P, Winkler V, Bärnighausen T, Traoré I, Ouedraogo S, Sié A, Sauerborn R, Becker N, Louis VR. Biological larviciding against malaria vector mosquitoes with Bacillus thuringiensis israelensis (Bti) - Long term observations and assessment of repeatability during an additional intervention year of a large-scale field trial in rural Burkina Faso. Glob Health Action 2021; 13:1829828. [PMID: 33028158 PMCID: PMC7580761 DOI: 10.1080/16549716.2020.1829828] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022] Open
Abstract
The first line of malaria vector control to date mainly relies on the use of long-lasting insecticidal nets (LLINs) and indoor residual spraying (IRS). For integrated vector management, targeting the vector larvae with biological larvicides such as Bacillus thuringiensis israelensis (Bti) can be an effective additional mainstay. This study presents data from the second intervention year of a large-scale trial on biological larviciding with Bti that was carried out in 127 rural villages and a semi-urban town in Burkina Faso. Here we present the reductions in malaria mosquitoes that were achieved by continuing the initial interventions for an additional year, important to assess sustainability and repeatability of the results from the first intervention year. Larviciding was performed applying two different larviciding choices ((a) treatment of all environmental breeding sites, and (b) selective treatment of those that were most productive for Anopheles larvae indicated by remote sensing based risk maps). Adult Anopheles spp. mosquito abundance was reduced by 77.4% (full treatment) and 63.5% (guided treatment) compared to the baseline year. The results showed that malaria vector abundance can be dramatically reduced using biological larviciding and that this effect can be achieved and maintained over several consecutive transmission seasons.
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Affiliation(s)
- Peter Dambach
- Institute of Global Health, University Hospital Heidelberg , Heidelberg, Germany
| | - Volker Winkler
- Institute of Global Health, University Hospital Heidelberg , Heidelberg, Germany
| | - Till Bärnighausen
- Institute of Global Health, University Hospital Heidelberg , Heidelberg, Germany
| | - Issouf Traoré
- Centre de Recherche en Santé de Nouna , Nouna, Burkina Faso
| | | | - Ali Sié
- Centre de Recherche en Santé de Nouna , Nouna, Burkina Faso
| | - Rainer Sauerborn
- Institute of Global Health, University Hospital Heidelberg , Heidelberg, Germany
| | - Norbert Becker
- German Mosquito Control Association (KABS) , Speyer, Germany
| | - Valérie R Louis
- Institute of Global Health, University Hospital Heidelberg , Heidelberg, Germany
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Sy O, Sarr PC, Assogba BS, Ndiaye M, Dia AK, Ndiaye A, Nourdine MA, Guèye OK, Konaté L, Gaye O, Faye O, Niang EA. Detection of kdr and ace-1 mutations in wild populations of Anopheles arabiensis and An. melas in a residual malaria transmission area of Senegal. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2021; 173:104783. [PMID: 33771262 DOI: 10.1016/j.pestbp.2021.104783] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2020] [Revised: 01/06/2021] [Accepted: 01/11/2021] [Indexed: 06/12/2023]
Abstract
In the central western Senegal, malaria transmission has been reduced low due to the combination of several effective control interventions. However, despite this encouraging achievement, residual malaria transmission still occurring in few areas, mainly ensured by An. arabiensis and An. melas. The resurgence or the persistence of the disease may have originated from the increase and the spread of insecticide resistance genes among natural malaria vectors populations. Therefore, assessing the status and mechanisms of insecticides resistance among targeted malaria vectors is of highest importance to better characterize factors underlying the residual transmission where it occurs. Malaria vectors were collected from three selected villages using nocturnal human landing catches (HLC) and pyrethrum spray collections (PSC) methods. An. gambiae s.l. specimens were identified at the species level then genotyped for the presence of kdr-west (L1014F), kdr-east (L1014S) and ace-1R mutations by qPCR. An. arabiensis (69.36%) and An. melas (27.99%) were the most common species of the Gambiae complex in the study area. Among An. arabiensis population, the allelic frequency of the kdr-east (22.66%) was relatively higher than for kdr-west mutation (9.96%). While for An. melas populations, the overall frequencies of both mutations were very low, being respectively 1.12% and 0.40% for the L1014S and L1014F mutations. With a global frequency of 2%, only the heterozygous form of the G119S mutation was found only in An. arabiensis and in all the study sites. The widespread occurrence of the kdr mutation in both An. arabiensis and An. melas natural populations, respectively the main and focal vectors in the central-western Senegal, may have contributed to maintaining malaria transmission in the area. Thus, compromising the effectiveness of pyrethroids-based vector control measures and the National Elimination Goal. Therefore, monitoring and managing properly insecticide resistance became a key programmatic intervention to achieve the elimination goal where feasible, as aimed by Senegal. Noteworthy, this is the first report of the ace-1 mutation in natural populations of An. arabiensis from Senegal, which need to be closely monitored to preserve one of the essential insecticide classes used in IRS to control the pyrethroids-resistant populations.
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Affiliation(s)
- O Sy
- Laboratoire d'Ecologie Vectorielle et Parasitaire, Faculté des Sciences et Techniques, Université Cheikh Anta Diop, Dakar, Sénégal.
| | - P C Sarr
- Laboratoire d'Ecologie Vectorielle et Parasitaire, Faculté des Sciences et Techniques, Université Cheikh Anta Diop, Dakar, Sénégal
| | - B S Assogba
- Medical Research Council Unit, The Gambia at the London School of Hygiene and Tropical Medicine, Banjul, the Gambia
| | - M Ndiaye
- Laboratoire de Parasitologie médicale, Faculté de Médecine, Pharmacie et d'Odonto-stomatologie, Université Cheikh Anta Diop, Dakar, Sénégal
| | - A K Dia
- Laboratoire d'Ecologie Vectorielle et Parasitaire, Faculté des Sciences et Techniques, Université Cheikh Anta Diop, Dakar, Sénégal
| | - A Ndiaye
- Laboratoire d'Ecologie Vectorielle et Parasitaire, Faculté des Sciences et Techniques, Université Cheikh Anta Diop, Dakar, Sénégal
| | - M A Nourdine
- Laboratoire d'Ecologie Vectorielle et Parasitaire, Faculté des Sciences et Techniques, Université Cheikh Anta Diop, Dakar, Sénégal
| | - O K Guèye
- Laboratoire d'Ecologie Vectorielle et Parasitaire, Faculté des Sciences et Techniques, Université Cheikh Anta Diop, Dakar, Sénégal
| | - L Konaté
- Laboratoire d'Ecologie Vectorielle et Parasitaire, Faculté des Sciences et Techniques, Université Cheikh Anta Diop, Dakar, Sénégal
| | - O Gaye
- Laboratoire de Parasitologie médicale, Faculté de Médecine, Pharmacie et d'Odonto-stomatologie, Université Cheikh Anta Diop, Dakar, Sénégal
| | - O Faye
- Laboratoire d'Ecologie Vectorielle et Parasitaire, Faculté des Sciences et Techniques, Université Cheikh Anta Diop, Dakar, Sénégal
| | - E A Niang
- Laboratoire d'Ecologie Vectorielle et Parasitaire, Faculté des Sciences et Techniques, Université Cheikh Anta Diop, Dakar, Sénégal
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29
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Soma DD, Poda SB, Hien AS, Namountougou M, Sangaré I, Sawadogo JME, Fournet F, Ouédraogo GA, Diabaté A, Moiroux N, Dabiré RK. Malaria vectors diversity, insecticide resistance and transmission during the rainy season in peri-urban villages of south-western Burkina Faso. Malar J 2021; 20:63. [PMID: 33494779 PMCID: PMC7831184 DOI: 10.1186/s12936-020-03554-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Revised: 12/14/2020] [Accepted: 12/16/2020] [Indexed: 11/16/2022] Open
Abstract
Background This study reports an updated description on malaria vector diversity, behaviour, insecticide resistance and malaria transmission in the Diébougou and Dano peri-urban areas, Burkina Faso. Methods Mosquitoes were caught monthly using CDC light traps and pyrethrum spray catches. Mosquitoes were identified using morphological taxonomic keys. PCR techniques were used to identify the species of the Anopheles gambiae complex and insecticide resistance mechanisms in a subset of Anopheles vectors. The Plasmodium sporozoite infection status and origins of blood meals of female mosquitoes were determined by ELISA methods. Larvae were collected, breed in the insectary and tested for phenotypic resistance against four insecticides using WHO bioassays. Results This study contributed to update the entomological data in two peri-urban areas of Southwest Burkina Faso. Anopheles populations were mostly anthropophilic and endophilic in both areas and exhibit high susceptibility to an organophosphate insecticide. This offers an alternative for the control of these pyrethroid-resistant populations. These data might help the National Malaria Control Programme for decision-making about vector control planning and resistance management. Conclusions This study contributed to update the entomological data in two peri-urban areas of Southwest Burkina Faso. Anopheles populations were mostly anthropophilic and endophilic in both areas and exhibit high susceptibility to an organophosphate insecticide. This offers an alternative for the control of these pyrethroid-resistant populations. These data might help the National Malaria Control Programme for decision-making about vector control planning and resistance management.
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Affiliation(s)
- Dieudonné Diloma Soma
- Institut de Recherche en Sciences de la Santé/Centre Muraz, Bobo-Dioulasso, Burkina Faso. .,Université Nazi Boni, Bobo-Dioulasso, Burkina Faso.
| | - Serge Bèwadéyir Poda
- Institut de Recherche en Sciences de la Santé/Centre Muraz, Bobo-Dioulasso, Burkina Faso.,Université Joseph Ki-Zerbo, Ouagadougou, Burkina Faso
| | - Aristide Sawdetuo Hien
- Institut de Recherche en Sciences de la Santé/Centre Muraz, Bobo-Dioulasso, Burkina Faso.,Université Nazi Boni, Bobo-Dioulasso, Burkina Faso
| | - Moussa Namountougou
- Institut de Recherche en Sciences de la Santé/Centre Muraz, Bobo-Dioulasso, Burkina Faso.,Université Nazi Boni, Bobo-Dioulasso, Burkina Faso
| | - Ibrahim Sangaré
- Institut de Recherche en Sciences de la Santé/Centre Muraz, Bobo-Dioulasso, Burkina Faso.,Université Nazi Boni, Bobo-Dioulasso, Burkina Faso
| | | | | | | | - Abdoulaye Diabaté
- Institut de Recherche en Sciences de la Santé/Centre Muraz, Bobo-Dioulasso, Burkina Faso
| | - Nicolas Moiroux
- Institut de Recherche en Sciences de la Santé/Centre Muraz, Bobo-Dioulasso, Burkina Faso.,MIVEGEC, Univ. Montpellier, CNRS, IRD, Montpellier, France
| | - Roch Kounbobr Dabiré
- Institut de Recherche en Sciences de la Santé/Centre Muraz, Bobo-Dioulasso, Burkina Faso.
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30
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Sanou R, Maïga H, Bilgo EM, Sawadogo SP, Sow BBD, Ouema A, Bayili K, Belem AMG, Toé LP, Dabiré RK, Diabaté A. Assessment of novel Lehmann's funnel entry trap prototypes performance to control malaria mosquito populations. Malar J 2021; 20:2. [PMID: 33386073 PMCID: PMC7777431 DOI: 10.1186/s12936-020-03532-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Accepted: 12/07/2020] [Indexed: 12/02/2022] Open
Abstract
Background There is a global consensus that new intervention tools are needed for the final steps toward malaria elimination/eradication. In a recent study in Burkina Faso, the Lehmann Funnel Entry Trap (LFET) has shown promising results in the reduction of mosquito densities, even in areas where insecticide resistance is as high as 80%. The LFET requires no chemicals and is self-operated. However, one of the issues with the original LFET is the size of the funnel, which often occupies too much space within users’ homes. Here, the performance of three new, smaller-sized LFET prototypes that combine a screening and killing effect on mosquitoes was assessed. Methods The study was carried out over three months during the rainy season in low and high malaria vector density sites, Soumousso and Vallée du Kou, respectively. The original LFET (or ‘Prototype 1’/‘P1’) was modified to produce three new prototypes, which were referred to as prototype 2 (‘the Medium’ or ‘P2’), prototype 3 (P3) and prototype 4 (P4). Each of the new prototypes was tested on eight days per month over the three-month period to assess their effectiveness in trapping and killing mosquitoes entering houses through the windows compared to the original LFET. Results Overall, 78,435 mosquitoes (mainly Anopheles gambiae sensu lato) were collected in the two study sites, both in the traps and in the houses. A total of 56,430 (72%) mosquitoes were collected from the traps. In Vallée du Kou, the original LFET caught a greater number of mosquitoes than the medium (prototype 2), whereas no difference was observed between the other new prototypes (3 and 4) and the medium. In Soumousso, both the original and medium LFETs collected significantly greater numbers of mosquitoes compared to prototypes 3 and 4. Conclusion This study has shown that the new LFET prototypes are effective in trapping mosquitoes in high mosquito density settings. A large-scale study with one of the prototypes will be needed to assess community acceptance of the traps and their ability to control malaria vectors.
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Affiliation(s)
- Roger Sanou
- Institut de Recherche en Sciences de La Santé (IRSS)/Centre Muraz, Bobo-Dioulasso, Burkina Faso. .,Université Nazi BONI de Bobo-Dioulasso, PO 1091, Bobo-Dioulasso, Burkina Faso.
| | - Hamidou Maïga
- Institut de Recherche en Sciences de La Santé (IRSS)/Centre Muraz, Bobo-Dioulasso, Burkina Faso
| | - Etienne M Bilgo
- Institut de Recherche en Sciences de La Santé (IRSS)/Centre Muraz, Bobo-Dioulasso, Burkina Faso
| | - Simon P Sawadogo
- Institut de Recherche en Sciences de La Santé (IRSS)/Centre Muraz, Bobo-Dioulasso, Burkina Faso
| | - Bazoumana B D Sow
- Institut de Recherche en Sciences de La Santé (IRSS)/Centre Muraz, Bobo-Dioulasso, Burkina Faso.,Université Nazi BONI de Bobo-Dioulasso, PO 1091, Bobo-Dioulasso, Burkina Faso
| | - Adama Ouema
- Institut de Recherche en Sciences de La Santé (IRSS)/Centre Muraz, Bobo-Dioulasso, Burkina Faso.,Université Nazi BONI de Bobo-Dioulasso, PO 1091, Bobo-Dioulasso, Burkina Faso
| | - Koama Bayili
- Institut de Recherche en Sciences de La Santé (IRSS)/Centre Muraz, Bobo-Dioulasso, Burkina Faso
| | | | - Léa Paré Toé
- Institut de Recherche en Sciences de La Santé (IRSS)/Centre Muraz, Bobo-Dioulasso, Burkina Faso
| | - Roch K Dabiré
- Institut de Recherche en Sciences de La Santé (IRSS)/Centre Muraz, Bobo-Dioulasso, Burkina Faso
| | - Abdoulaye Diabaté
- Institut de Recherche en Sciences de La Santé (IRSS)/Centre Muraz, Bobo-Dioulasso, Burkina Faso.
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31
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Yaro JB, Ouedraogo A, Ouedraogo ZA, Diarra A, Lankouande M, Agboraw E, Worrall E, Toe KH, Sanou A, Guelbeogo WM, Sagnon N, Ranson H, Tiono AB, Lindsay SW, Wilson AL. A cohort study to identify risk factors for Plasmodium falciparum infection in Burkinabe children: implications for other high burden high impact countries. Malar J 2020; 19:371. [PMID: 33066799 PMCID: PMC7565747 DOI: 10.1186/s12936-020-03443-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Accepted: 10/07/2020] [Indexed: 11/30/2022] Open
Abstract
BACKGROUND Progress in controlling malaria has stalled in recent years. Today the malaria burden is increasingly concentrated in a few countries, including Burkina Faso, where malaria is not declining. A cohort study was conducted to identify risk factors for malaria infection in children in southwest Burkina Faso, an area with high insecticide-treated net (ITN) coverage and insecticide-resistant vectors. METHODS Incidence of Plasmodium falciparum infection was measured in 252 children aged 5 to 15 years, using active and passive detection, during the 2017 transmission season, following clearance of infection. Demographic, socio-economic, environmental, and entomological risk factors, including use of ITNs and insecticide resistance were monitored. RESULTS During the six-month follow-up period, the overall incidence of P. falciparum infection was 2.78 episodes per child (95% CI = 2.66-2.91) by microscopy, and 3.11 (95% CI = 2.95-3.28) by polymerase chain reaction (PCR). The entomological inoculation rate (EIR) was 80.4 infective bites per child over the six-month malaria transmission season. At baseline, 80.6% of children were reported as sleeping under an ITN the previous night, although at the last survey, 23.3% of nets were in poor condition and considered no longer protective. No association was found between the rate of P. falciparum infection and either EIR (incidence rate ratio (IRR): 1.00, 95% CI: 1.00-1.00, p = 0.08) or mortality in WHO tube tests when vectors were exposed to 0.05% deltamethrin (IRR: 1.05, 95% CI: 0.73-1.50, p = 0.79). Travel history (IRR: 1.52, 95% CI: 1.45-1.59, p < 0.001) and higher socio-economic status were associated with an increased risk of P. falciparum infection (IRR: 1.05, 95% CI: 1.00-1.11, p = 0.04). CONCLUSIONS Incidence of P. falciparum infection remains overwhelmingly high in the study area. The study findings suggest that because of the exceptionally high levels of malaria transmission in the study area, malaria elimination cannot be achieved solely by mass deployment of ITNs and additional control measures are needed.
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Affiliation(s)
- Jean Baptiste Yaro
- Centre National de Recherche et de Formation sur le Paludisme, Ouagadougou, Burkina Faso
- Department of Biosciences, Durham University, Durham, UK
| | - Alphonse Ouedraogo
- Centre National de Recherche et de Formation sur le Paludisme, Ouagadougou, Burkina Faso
| | - Z Amidou Ouedraogo
- Centre National de Recherche et de Formation sur le Paludisme, Ouagadougou, Burkina Faso
| | - Amidou Diarra
- Centre National de Recherche et de Formation sur le Paludisme, Ouagadougou, Burkina Faso
| | - Malik Lankouande
- Centre National de Recherche et de Formation sur le Paludisme, Ouagadougou, Burkina Faso
| | - Efundem Agboraw
- Department of Vector Biology, Liverpool School of Tropical Medicine, Liverpool, UK
| | - Eve Worrall
- Department of Vector Biology, Liverpool School of Tropical Medicine, Liverpool, UK
| | - Kobié Hyacinthe Toe
- Centre National de Recherche et de Formation sur le Paludisme, Ouagadougou, Burkina Faso
| | - Antoine Sanou
- Centre National de Recherche et de Formation sur le Paludisme, Ouagadougou, Burkina Faso
- Institute of Biodiversity Animal Health & Comparative Medicine, Glasgow University, Glasgow, UK
| | - W Moussa Guelbeogo
- Centre National de Recherche et de Formation sur le Paludisme, Ouagadougou, Burkina Faso
| | - N'Fale Sagnon
- Centre National de Recherche et de Formation sur le Paludisme, Ouagadougou, Burkina Faso
| | - Hilary Ranson
- Department of Vector Biology, Liverpool School of Tropical Medicine, Liverpool, UK
| | - Alfred B Tiono
- Centre National de Recherche et de Formation sur le Paludisme, Ouagadougou, Burkina Faso
| | | | - Anne L Wilson
- Department of Vector Biology, Liverpool School of Tropical Medicine, Liverpool, UK.
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Gnambani EJ, Bilgo E, Sanou A, Dabiré RK, Diabaté A. Infection of highly insecticide-resistant malaria vector Anopheles coluzzii with entomopathogenic bacteria Chromobacterium violaceum reduces its survival, blood feeding propensity and fecundity. Malar J 2020; 19:352. [PMID: 33008454 PMCID: PMC7530970 DOI: 10.1186/s12936-020-03420-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2020] [Accepted: 09/17/2020] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND This is now a concern that malaria eradication will not be achieved without the introduction of novel control tools. Microbiological control might be able to make a greater contribution to vector control in the future. The interactions between bacteria and mosquito make mosquito microbiota really promising from a disease control perspective. Here, the impact of Chromobacterium violaceum infections, isolated from both larvae and adult of wild-caught Anopheles gambiae sensu lato mosquitoes in Burkina Faso, was evaluated on mosquito survival, blood feeding and fecundity. METHODS To assess entomopathogenic effects of C. violaceum infection on mosquitoes, three different types of bioassays were performed in laboratory. These bioassays aimed to evaluate the impact of C. violaceum infection on mosquito survival, blood feeding and fecundity, respectively. During bioassays mosquitoes were infected through the well-established system of cotton ball soaked with 6% glucose containing C. violaceum. RESULTS Chromobacterium violaceum kills pyrethroid resistant Anopheles coluzzii (LT80 of 8.78 days ± 0.18 at 108 bacteria cell/ml of sugar meal). Interestingly, this bacterium had other negative effects on mosquito lifespan by significantly reducing (~ 59%, P < 0.001) the mosquito feeding willingness from day 4-post infection (~ 81% would seek a host to blood feed) to 9- day post infection (22 ± 4.62% would seek a host to blood feed). Moreover, C. violaceum considerably jeopardized the egg laying (~ 16 eggs laid/mosquito with C. violaceum infected mosquitoes vs ~ 129 eggs laid/mosquito with control mosquitoes) and hatching of mosquitoes (a reduction of ~ 22% of hatching rate with C. violaceum infected mosquitoes). Compared to the bacterial uninfected mosquitoes, mosquitoes infected with C. violaceum showed significantly higher retention rates of immature eggs and follicles. CONCLUSION These data showed important properties of Burkina Faso C. violaceum strains, which are highly virulent against insecticide-resistant An. coluzzii, and reduce both mosquito blood feeding and fecundity propensities. However, additional studies as the sequencing of C. violaceum genome and the potential toxins secreted will provide useful information render it a potential candidate for the biological control strategies of malaria and other disease vectors.
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Affiliation(s)
- Edounou Jacques Gnambani
- Institut de Recherche en Sciences de La Santé (IRSS) / Centre Muraz, Bobo Dioulasso, Burkina Faso.,Université Nazi Boni / Centre Muraz, Bobo-Dioulasso, Burkina Faso
| | - Etienne Bilgo
- Institut de Recherche en Sciences de La Santé (IRSS) / Centre Muraz, Bobo Dioulasso, Burkina Faso.
| | - Adama Sanou
- Université Nazi Boni / Centre Muraz, Bobo-Dioulasso, Burkina Faso
| | - Roch K Dabiré
- Institut de Recherche en Sciences de La Santé (IRSS) / Centre Muraz, Bobo Dioulasso, Burkina Faso
| | - Abdoulaye Diabaté
- Institut de Recherche en Sciences de La Santé (IRSS) / Centre Muraz, Bobo Dioulasso, Burkina Faso.
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Keïta M, Kané F, Thiero O, Traoré B, Zeukeng F, Sodio AB, Traoré SF, Djouaka R, Doumbia S, Sogoba N. Acetylcholinesterase (ace-1 R) target site mutation G119S and resistance to carbamates in Anopheles gambiae (sensu lato) populations from Mali. Parasit Vectors 2020; 13:283. [PMID: 32503614 PMCID: PMC7275337 DOI: 10.1186/s13071-020-04150-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Accepted: 05/27/2020] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The long-lasting insecticidal nets (LLINs) and indoor residual spraying of insecticide (IRS) are major malaria vector control strategies in Mali. The success of control strategies depends on a better understanding of the status of malaria vectors with respect to the insecticides used. In this study we evaluate the level of resistance of Anopheles gambiae (sensu lato) to bendiocarb and the molecular mechanism that underlies it. METHODS Larvae of An. gambiae (s.l.) were collected from breeding habitats encountered in the three study sites and bioassayed with bendiocarb. The ace-1 target site substitution G119S was genotyped using a TaqMan assay. RESULTS The three species of the An. gambiae complex in Mali, i.e. An. arabiensis, An. coluzzii and An. gambiae (s.s.) were found in sympatry in the three surveyed localities with different frequencies. We observed a resistance and suspicious resistance of the three species to bendiocarb with a mortality rate ranging from 37% to 86%. The allelic frequency of the G119S mutation was higher in An. gambiae (s.s.) compared to the other two species; 42.86%, 25.61% and 16.67% respectively in Dangassa, Koula, and Karadié. The allelic frequency of G119S in An. coluzzii ranged from 4.5% to 8.33% and from 1.43% to 21.15% for An. arabiensis. After exposure to bendiocarb, the G119S mutation was found only in survivors. The survival of Anopheles gambiae (s.l) populations from the three surveyed localities was associated with the presence of the mutation. CONCLUSIONS The study highlights the implication of G119S mutation in bendiocarb resistance in An. gambiae (s.s.), An. arabiensis and An. coluzzii populations from the three surveyed localities.
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Affiliation(s)
- Moussa Keïta
- Malaria Research and Training Center, International Center for Excellence in Research, Faculty of Medicine and Odonto Stomatology, University of Sciences, Techniques and Technologies of Bamako (USTTB), Bamako, Mali.
| | - Fousseyni Kané
- Malaria Research and Training Center, International Center for Excellence in Research, Faculty of Medicine and Odonto Stomatology, University of Sciences, Techniques and Technologies of Bamako (USTTB), Bamako, Mali
| | - Oumar Thiero
- Malaria Research and Training Center, International Center for Excellence in Research, Faculty of Medicine and Odonto Stomatology, University of Sciences, Techniques and Technologies of Bamako (USTTB), Bamako, Mali
| | - Boissé Traoré
- Malaria Research and Training Center, International Center for Excellence in Research, Faculty of Medicine and Odonto Stomatology, University of Sciences, Techniques and Technologies of Bamako (USTTB), Bamako, Mali
| | - Francis Zeukeng
- The AgroEcohealth Platform, International Institute of Tropical Agriculture (IITA-Benin), 08 Tripostal, P.O. Box 0932, Cotonou, Benin
| | - Ambiélè Bernard Sodio
- Faculty of Science and Technique, University of Sciences, Techniques and Technologies of Bamako (USTTB), Bamako, Mali
| | - Sekou Fantamady Traoré
- Malaria Research and Training Center, International Center for Excellence in Research, Faculty of Medicine and Odonto Stomatology, University of Sciences, Techniques and Technologies of Bamako (USTTB), Bamako, Mali
| | - Rousseau Djouaka
- The AgroEcohealth Platform, International Institute of Tropical Agriculture (IITA-Benin), 08 Tripostal, P.O. Box 0932, Cotonou, Benin
| | - Seydou Doumbia
- Malaria Research and Training Center, International Center for Excellence in Research, Faculty of Medicine and Odonto Stomatology, University of Sciences, Techniques and Technologies of Bamako (USTTB), Bamako, Mali
| | - Nafomon Sogoba
- Malaria Research and Training Center, International Center for Excellence in Research, Faculty of Medicine and Odonto Stomatology, University of Sciences, Techniques and Technologies of Bamako (USTTB), Bamako, Mali
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Brown F, Paton DG, Catteruccia F, Ranson H, Ingham VA. A steroid hormone agonist reduces female fitness in insecticide-resistant Anopheles populations. INSECT BIOCHEMISTRY AND MOLECULAR BIOLOGY 2020; 121:103372. [PMID: 32276112 PMCID: PMC10569452 DOI: 10.1016/j.ibmb.2020.103372] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2020] [Revised: 03/31/2020] [Accepted: 03/31/2020] [Indexed: 06/11/2023]
Abstract
Insecticide based vector control tools such as insecticide treated bednets and indoor residual spraying represent the cornerstones of malaria control programs. Resistance to chemistries used in these programs is now widespread and represents a significant threat to the gains seen in reducing malaria-related morbidity and mortality. Recently, disruption of the 20-hydroxyecdysone steroid hormone pathway was shown to reduce Plasmodium development and significantly reduce both longevity and egg production in a laboratory susceptible Anopheles gambiae population. Here, we demonstrate that disruption of this pathway by application of the dibenzoylhydrazine, methoxyfenozide (DBH-M), to insecticide resistant An. coluzzii, An. gambiae sl and An. funestus populations significantly reduces egg production in both topical and tarsal application. Moreover, DBH-M reduces adult longevity when applied topically, and tarsally after blood feeding. As the cytochrome p450s elevated in pyrethroid resistant Anopheles only bind DBH-M very weakly, this compound is unlikely to be subject to cross-resistance in a field-based setting. Manipulation of this hormonal signalling pathway therefore represents a potential complementary approach to current malaria control strategies, particularly in areas where high levels of insecticide resistance are compromising existing tools.
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Affiliation(s)
- Faye Brown
- Department of Vector Biology, Liverpool School of Tropical Medicine, Pembroke Place, Liverpool, L35QA, UK
| | - Douglas G Paton
- Department of Immunology and Infectious Diseases, Harvard T. H. Chan School of Public Health, 655 Huntington Ave, Boston, MA, 02115, USA
| | - Flaminia Catteruccia
- Department of Immunology and Infectious Diseases, Harvard T. H. Chan School of Public Health, 655 Huntington Ave, Boston, MA, 02115, USA
| | - Hilary Ranson
- Department of Vector Biology, Liverpool School of Tropical Medicine, Pembroke Place, Liverpool, L35QA, UK
| | - Victoria A Ingham
- Department of Vector Biology, Liverpool School of Tropical Medicine, Pembroke Place, Liverpool, L35QA, UK.
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Perugini E, Guelbeogo WM, Calzetta M, Manzi S, Virgillito C, Caputo B, Pichler V, Ranson H, Sagnon N, Della Torre A, Pombi M. Behavioural plasticity of Anopheles coluzzii and Anopheles arabiensis undermines LLIN community protective effect in a Sudanese-savannah village in Burkina Faso. Parasit Vectors 2020; 13:277. [PMID: 32487147 PMCID: PMC7268364 DOI: 10.1186/s13071-020-04142-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Accepted: 05/21/2020] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND Despite the overall major impact of long-lasting insecticide treated nets (LLINs) in eliciting individual and collective protection to malaria infections, some sub-Saharan countries, including Burkina Faso, still carry a disproportionately high share of the global malaria burden. This study aims to analyse the possible entomological bases of LLIN limited impact, focusing on a LLIN-protected village in the Plateau Central region of Burkina Faso. METHODS Human landing catches (HLCs) were carried out in 2015 for 12 nights both indoors and outdoors at different time windows during the highest biting activity phase for Anopheles gambiae (s.l.). Collected specimens were morphologically and molecularly identified and processed for Plasmodium detection and L1014F insecticide-resistance allele genotyping. RESULTS Almost 2000 unfed An. gambiae (s.l.) (54% Anopheles coluzzii and 44% Anopheles arabiensis) females landing on human volunteers were collected, corresponding to a median number of 23.5 females/person/hour. No significant differences were observed in median numbers of mosquitoes collected indoors and outdoors, nor between sporozoite rates in An. coluzzii (6.1%) and An. arabiensis (5.5%). The estimated median hourly entomological inoculation rate (EIR) on volunteers was 1.4 infective bites/person/hour. Results do not show evidence of the biting peak during night hours typical for An. gambiae (s.l.) in the absence of bednet protection. The frequency of the L1014F resistant allele (n = 285) was 66% in An. coluzzii and 38% in An. arabiensis. CONCLUSIONS The observed biting rate and sporozoite rates are in line with the literature data available for An. gambiae (s.l.) in the same geographical area before LLIN implementation and highlight high levels of malaria transmission in the study village. Homogeneous biting rate throughout the night and lack of preference for indoor-biting activity, suggest the capacity of both An. coluzzii and An. arabiensis to adjust their host-seeking behaviour to bite humans despite bednet protection, accounting for the maintenance of high rates of mosquito infectivity and malaria transmission. These results, despite being limited to a local situation in Burkina Faso, represent a paradigmatic example of how high densities and behavioural plasticity in the vector populations may contribute to explaining the limited impact of LLINs on malaria transmission in holo-endemic Sudanese savannah areas in West Africa.
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Affiliation(s)
- Eleonora Perugini
- Dipartimento di Sanità Pubblica e Malattie Infettive, Laboratory affiliated to Istituto Pasteur Italia, Fondazione Cenci Bolognetti, Sapienza Università di Roma, Rome, 00185, Italy
| | - Wamdaogo Moussa Guelbeogo
- Centre National de Recherche et Formation sur le Paludisme (CNRFP), Ouagadougou 01, BP 2208, Burkina Faso
| | - Maria Calzetta
- Dipartimento di Sanità Pubblica e Malattie Infettive, Laboratory affiliated to Istituto Pasteur Italia, Fondazione Cenci Bolognetti, Sapienza Università di Roma, Rome, 00185, Italy
| | - Sara Manzi
- Dipartimento di Sanità Pubblica e Malattie Infettive, Laboratory affiliated to Istituto Pasteur Italia, Fondazione Cenci Bolognetti, Sapienza Università di Roma, Rome, 00185, Italy
| | - Chiara Virgillito
- Dipartimento di Sanità Pubblica e Malattie Infettive, Laboratory affiliated to Istituto Pasteur Italia, Fondazione Cenci Bolognetti, Sapienza Università di Roma, Rome, 00185, Italy.,Dipartimento di Biodiversità ed Ecologia Molecolare, Centro Ricerca e Innovazione, Fondazione Edmund Mach, San Michele all'Adige, Trento, Italy
| | - Beniamino Caputo
- Dipartimento di Sanità Pubblica e Malattie Infettive, Laboratory affiliated to Istituto Pasteur Italia, Fondazione Cenci Bolognetti, Sapienza Università di Roma, Rome, 00185, Italy
| | - Verena Pichler
- Dipartimento di Sanità Pubblica e Malattie Infettive, Laboratory affiliated to Istituto Pasteur Italia, Fondazione Cenci Bolognetti, Sapienza Università di Roma, Rome, 00185, Italy
| | - Hilary Ranson
- Department of Vector Biology, Liverpool School of Tropical Medicine, Liverpool, L3 5QA, UK
| | - N'Fale Sagnon
- Centre National de Recherche et Formation sur le Paludisme (CNRFP), Ouagadougou 01, BP 2208, Burkina Faso
| | - Alessandra Della Torre
- Dipartimento di Sanità Pubblica e Malattie Infettive, Laboratory affiliated to Istituto Pasteur Italia, Fondazione Cenci Bolognetti, Sapienza Università di Roma, Rome, 00185, Italy.
| | - Marco Pombi
- Dipartimento di Sanità Pubblica e Malattie Infettive, Laboratory affiliated to Istituto Pasteur Italia, Fondazione Cenci Bolognetti, Sapienza Università di Roma, Rome, 00185, Italy.
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Namountougou M, Soma DD, Balboné M, Kaboré DA, Kientega M, Hien A, Coulibaly A, Ouattara PE, Meda BG, Drabo S, Koala L, Nignan C, Kagoné T, Diabaté A, Fournet F, Gnankiné O, Dabiré RK. Monitoring Insecticide Susceptibility in Aedes Aegypti Populations from the Two Biggest Cities, Ouagadougou and Bobo-Dioulasso, in Burkina Faso: Implication of Metabolic Resistance. Trop Med Infect Dis 2020; 5:E84. [PMID: 32471266 PMCID: PMC7345320 DOI: 10.3390/tropicalmed5020084] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2020] [Revised: 02/26/2020] [Accepted: 02/28/2020] [Indexed: 11/16/2022] Open
Abstract
In West Africa, Aedes aegypti remains the major vector of dengue virus. Since 2013, dengue fever has been reemerging in Burkina Faso with annual outbreaks, thus becoming a major public health problem. Its control relies on vector control, which is unfortunately facing the problem of insecticide resistance. At the time of this study, although data on phenotypic resistance were available, information related to the metabolic resistance in Aedes populations from Burkina Faso remained very scarce. Here, we assessed the phenotypic and the metabolic resistance of Ae. aegypti populations sampled from the two main urban areas (Ouagadougou and Bobo-Dioulasso) of Burkina Faso. Insecticide susceptibility bioassays to chlorpyriphos-methyl 0.4%, bendiocarb 0.1% and deltamethrin 0.05% were performed on natural populations of Ae. aegypti using the WHO protocol. The activity of enzymes involved in the rapid detoxification of insecticides, especially non-specific esterases, oxidases (cytochrome P450) and glutathione-S-transferases, was measured on individual mosquitos. The mortality rates for deltamethrin 0.05% were low and ranged from 20.72% to 89.62% in the Bobo-Dioulasso and Ouagadougou sites, respectively. When bendiocarb 0.1% was tested, the mortality rates ranged from 7.73% to 71.23%. Interestingly, in the two urban areas, mosquitoes were found to be fully susceptible to chlorpyriphos-methyl 0.4%. Elevated activity of non-specific esterases and glutathione-S-transferases was reported, suggesting multiple resistance mechanisms involved in Ae. aegypti populations from Bobo-Dioulasso and Ouagadougou (including cytochrome P450). This update to the insecticide resistance status within Ae. aegypti populations in the two biggest cities is important to better plan dengue vectors control in the country and provides valuable information for improving vector control strategies in Burkina Faso, West Africa.
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Affiliation(s)
- Moussa Namountougou
- Institut de Recherche en Sciences de la Santé (IRSS), Bobo-Dioulasso BP 545, Burkina Faso; (D.D.S.); (D.A.K.); (M.K.); (A.H.); (P.E.O.); (B.G.M.); (L.K.); (C.N.); (A.D.)
- Département des Sciences Biomédicales, Centre Muraz, Bobo-Dioulasso BP 390, Burkina Faso;
- Institut Supérieur des Sciences de la Santé, Université Nazi Boni, Bobo-Dioulasso BP 1091, Burkina Faso
| | - Dieudonné Diloma Soma
- Institut de Recherche en Sciences de la Santé (IRSS), Bobo-Dioulasso BP 545, Burkina Faso; (D.D.S.); (D.A.K.); (M.K.); (A.H.); (P.E.O.); (B.G.M.); (L.K.); (C.N.); (A.D.)
- Département des Sciences Biomédicales, Centre Muraz, Bobo-Dioulasso BP 390, Burkina Faso;
- Institut Supérieur des Sciences de la Santé, Université Nazi Boni, Bobo-Dioulasso BP 1091, Burkina Faso
| | - Mahamoudou Balboné
- Département de Biologie et de Physiologie Animales, Université Joseph Ki-Zerbo, Ouagadougou BP 7021, Burkina Faso; (M.B.); (S.D.); (O.G.)
| | - Didier Alexandre Kaboré
- Institut de Recherche en Sciences de la Santé (IRSS), Bobo-Dioulasso BP 545, Burkina Faso; (D.D.S.); (D.A.K.); (M.K.); (A.H.); (P.E.O.); (B.G.M.); (L.K.); (C.N.); (A.D.)
- Département des Sciences Biomédicales, Centre Muraz, Bobo-Dioulasso BP 390, Burkina Faso;
| | - Mahamadi Kientega
- Institut de Recherche en Sciences de la Santé (IRSS), Bobo-Dioulasso BP 545, Burkina Faso; (D.D.S.); (D.A.K.); (M.K.); (A.H.); (P.E.O.); (B.G.M.); (L.K.); (C.N.); (A.D.)
- Département des Sciences Biomédicales, Centre Muraz, Bobo-Dioulasso BP 390, Burkina Faso;
| | - Aristide Hien
- Institut de Recherche en Sciences de la Santé (IRSS), Bobo-Dioulasso BP 545, Burkina Faso; (D.D.S.); (D.A.K.); (M.K.); (A.H.); (P.E.O.); (B.G.M.); (L.K.); (C.N.); (A.D.)
- Département des Sciences Biomédicales, Centre Muraz, Bobo-Dioulasso BP 390, Burkina Faso;
| | - Ahmed Coulibaly
- Unité de Formation et de Recherche en Sciences et Techniques, Université Norbert Zongo, Koudougou BP 376, Burkina Faso;
| | - Parfait Eric Ouattara
- Institut de Recherche en Sciences de la Santé (IRSS), Bobo-Dioulasso BP 545, Burkina Faso; (D.D.S.); (D.A.K.); (M.K.); (A.H.); (P.E.O.); (B.G.M.); (L.K.); (C.N.); (A.D.)
- Département des Sciences Biomédicales, Centre Muraz, Bobo-Dioulasso BP 390, Burkina Faso;
| | - Benson Georges Meda
- Institut de Recherche en Sciences de la Santé (IRSS), Bobo-Dioulasso BP 545, Burkina Faso; (D.D.S.); (D.A.K.); (M.K.); (A.H.); (P.E.O.); (B.G.M.); (L.K.); (C.N.); (A.D.)
- Département des Sciences Biomédicales, Centre Muraz, Bobo-Dioulasso BP 390, Burkina Faso;
| | - Samuel Drabo
- Département de Biologie et de Physiologie Animales, Université Joseph Ki-Zerbo, Ouagadougou BP 7021, Burkina Faso; (M.B.); (S.D.); (O.G.)
| | - Lassane Koala
- Institut de Recherche en Sciences de la Santé (IRSS), Bobo-Dioulasso BP 545, Burkina Faso; (D.D.S.); (D.A.K.); (M.K.); (A.H.); (P.E.O.); (B.G.M.); (L.K.); (C.N.); (A.D.)
- Département des Sciences Biomédicales, Centre Muraz, Bobo-Dioulasso BP 390, Burkina Faso;
| | - Charles Nignan
- Institut de Recherche en Sciences de la Santé (IRSS), Bobo-Dioulasso BP 545, Burkina Faso; (D.D.S.); (D.A.K.); (M.K.); (A.H.); (P.E.O.); (B.G.M.); (L.K.); (C.N.); (A.D.)
- Département des Sciences Biomédicales, Centre Muraz, Bobo-Dioulasso BP 390, Burkina Faso;
| | - Thérèse Kagoné
- Département des Sciences Biomédicales, Centre Muraz, Bobo-Dioulasso BP 390, Burkina Faso;
| | - Abdoulaye Diabaté
- Institut de Recherche en Sciences de la Santé (IRSS), Bobo-Dioulasso BP 545, Burkina Faso; (D.D.S.); (D.A.K.); (M.K.); (A.H.); (P.E.O.); (B.G.M.); (L.K.); (C.N.); (A.D.)
- Département des Sciences Biomédicales, Centre Muraz, Bobo-Dioulasso BP 390, Burkina Faso;
| | - Florence Fournet
- Maladies Infectieuses et Vecteurs: Écologie et Contrôle (MIVEGEC), Univ Montpellier, CNRS, IRD, 34394 Montpellier, France;
| | - Olivier Gnankiné
- Département de Biologie et de Physiologie Animales, Université Joseph Ki-Zerbo, Ouagadougou BP 7021, Burkina Faso; (M.B.); (S.D.); (O.G.)
| | - Roch Kounbobr Dabiré
- Institut de Recherche en Sciences de la Santé (IRSS), Bobo-Dioulasso BP 545, Burkina Faso; (D.D.S.); (D.A.K.); (M.K.); (A.H.); (P.E.O.); (B.G.M.); (L.K.); (C.N.); (A.D.)
- Département des Sciences Biomédicales, Centre Muraz, Bobo-Dioulasso BP 390, Burkina Faso;
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Assogba BS, Pasteur N, Makoundou P, Unal S, Baba-Moussa L, Labbé P, Weill M. Dynamic of resistance alleles of two major insecticide targets in Anopheles gambiae (s.l.) populations from Benin, West Africa. Parasit Vectors 2020; 13:134. [PMID: 32171326 PMCID: PMC7071764 DOI: 10.1186/s13071-020-4006-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Accepted: 03/03/2020] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Insecticide resistance is a growing concern for malaria control and vector control effectiveness relies on assessing it distribution and understanding its evolution. METHODS We assessed resistance levels and the frequencies of two major target-site mutations, L1014F-VGSC and G119S-ace-1, conferring resistance to pyrethroids (PYRs) and carbamates/organophosphates (CXs/OPs) insecticides. These data were compared to those acquired between 2006 and 2010 to follow resistance evolutionary trends over ten years. RESULTS We report the results of a 3-year survey (2013-2015) of insecticide resistance in 13 localities across the whole country of Benin. Permethrin (PYR) resistance was found in all populations tested, L1014F-VGSC being almost fixed everywhere, while bendiocarb resistance was limited to a few localities, G119S-ace-1 remaining rare, with very limited variations during surveyed period. Interestingly, we found no effect of the type of insecticide pressure on the dynamics of these mutations. CONCLUSIONS These results confirm both the high prevalence of PYR resistance and the potential of CXs/OPs as short- to medium-term alternatives in Benin. They also underline the need for regular resistance monitoring and informed management in their usage, as the G119S-ace-1 mutation is already present in Benin and surrounding countries. Their unwise usage would rapidly lead to its spread, which would jeopardize PYR-resistant Anopheles control.
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Affiliation(s)
- Benoît S. Assogba
- Institut des Sciences de l’Evolution de Montpellier (ISEM), UMR CNRS-IRD-EPHE-Université de Montpellier, Place Eugène Bataillon, 34095 Montpellier, France
- Faculté des Sciences et Techniques, Laboratoire de Biologie et de Typage Moléculaire en Microbiologie, Université d’Abomey Calavi, 05 BP 1604, Cotonou, Benin
- Institut Régional de Santé Publique, Université d’Abomey Calavi, 01 BP 918, Cotonou, Benin
- Disease Control and Elimination Department, Medical Research Council, Unit The Gambia at London School of Hygiene and Tropical Medicine, Fajara, Gambia
| | - Nicole Pasteur
- Institut des Sciences de l’Evolution de Montpellier (ISEM), UMR CNRS-IRD-EPHE-Université de Montpellier, Place Eugène Bataillon, 34095 Montpellier, France
| | - Patrick Makoundou
- Institut des Sciences de l’Evolution de Montpellier (ISEM), UMR CNRS-IRD-EPHE-Université de Montpellier, Place Eugène Bataillon, 34095 Montpellier, France
| | - Sandra Unal
- Institut des Sciences de l’Evolution de Montpellier (ISEM), UMR CNRS-IRD-EPHE-Université de Montpellier, Place Eugène Bataillon, 34095 Montpellier, France
| | - Lamine Baba-Moussa
- Faculté des Sciences et Techniques, Laboratoire de Biologie et de Typage Moléculaire en Microbiologie, Université d’Abomey Calavi, 05 BP 1604, Cotonou, Benin
| | - Pierrick Labbé
- Institut des Sciences de l’Evolution de Montpellier (ISEM), UMR CNRS-IRD-EPHE-Université de Montpellier, Place Eugène Bataillon, 34095 Montpellier, France
| | - Mylène Weill
- Institut des Sciences de l’Evolution de Montpellier (ISEM), UMR CNRS-IRD-EPHE-Université de Montpellier, Place Eugène Bataillon, 34095 Montpellier, France
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Genetic analysis and population structure of the Anopheles gambiae complex from different ecological zones of Burkina Faso. INFECTION GENETICS AND EVOLUTION 2020; 81:104261. [PMID: 32092481 DOI: 10.1016/j.meegid.2020.104261] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2019] [Revised: 02/20/2020] [Accepted: 02/21/2020] [Indexed: 11/21/2022]
Abstract
The Anopheles gambiae complex (Diptera: Culicidae) is the most important vector for malaria in Sub-Saharan Africa, besides other vectors such as Anopheles funestus. Malaria vector control should encompass specific identification, genetic diversity and population structure of An. gambiae to design vector control strategies. The aim of this study was to determine the distribution of sibling species of the An. gambiae complex according to climatic regions related to cotton-growing or cotton-free areas by using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP). Then, variation in mitochondrial cytochrome c oxidase 1 (COI) was used to assess the genetic structure within and between populations from our selected ecological zones. At the sibling species level, the following proportions were found across all samples (n = 180): An. coluzzii 65.56%, An. gambiae stricto sensu (s.s). 21.11%, and An. arabiensis 3.33%. Hybrids between An. gambiae s.s. and An. coluzzii (7.78%) and hybrids between An. coluzzii and An. arabiensis (2.22%) were found. The phylogenetic tree and Integer Neighbour-Joining (IntNJ) haplotype network did not reveal any distinct genetic structure pattern related to climatic or agricultural conditions in Burkina Faso. The Fst (Wright's F-statistic) values close to zero showed a free gene flow and no differentiation in An. gambiae complex populations. Furthermore, neutrality indices calculated by Tajima's D, Fu and Li's D⁎, Fu and Li's F⁎, Fu's Fs tests suggested an excess of rare mutations in the populations. Overall, variation in the proportions of An. gambiae s.s., An. coluzzii and An. arabiensis was found according to climatic regions, but COI analysis did not evidence any population structuring of the An. gambiae complex. These scientific contributions can be used as a basis for further in-depth study of the genetic diversity of the An. gambiae complex for epidemiological risk assessment of malaria in Burkina Faso.
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Ingham VA, Anthousi A, Douris V, Harding NJ, Lycett G, Morris M, Vontas J, Ranson H. A sensory appendage protein protects malaria vectors from pyrethroids. Nature 2020; 577:376-380. [PMID: 31875852 PMCID: PMC6974402 DOI: 10.1038/s41586-019-1864-1] [Citation(s) in RCA: 101] [Impact Index Per Article: 25.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2019] [Accepted: 11/24/2019] [Indexed: 11/15/2022]
Abstract
Pyrethroid-impregnated bed nets have driven considerable reductions in malaria-associated morbidity and mortality in Africa since the beginning of the century1. The intense selection pressure exerted by bed nets has precipitated widespread and escalating resistance to pyrethroids in African Anopheles populations, threatening to reverse the gains that been made by malaria control2. Here we show that expression of a sensory appendage protein (SAP2), which is enriched in the legs, confers pyrethroid resistance to Anopheles gambiae. Expression of SAP2 is increased in insecticide-resistant populations and is further induced after the mosquito comes into contact with pyrethroids. SAP2 silencing fully restores mortality of the mosquitoes, whereas SAP2 overexpression results in increased resistance, probably owing to high-affinity binding of SAP2 to pyrethroid insecticides. Mining of genome sequence data reveals a selective sweep near the SAP2 locus in the mosquito populations of three West African countries (Cameroon, Guinea and Burkina Faso) with the observed increase in haplotype-associated single-nucleotide polymorphisms mirroring the increasing resistance of mosquitoes to pyrethroids reported in Burkina Faso. Our study identifies a previously undescribed mechanism of insecticide resistance that is likely to be highly relevant to malaria control efforts.
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Affiliation(s)
- Victoria A Ingham
- Vector Biology, Liverpool School of Tropical Medicine, Liverpool, UK.
| | - Amalia Anthousi
- Vector Biology, Liverpool School of Tropical Medicine, Liverpool, UK
| | - Vassilis Douris
- Foundation for Research and Technology - Hellas (FORTH), Institute of Molecular Biology and Biotechnology, Heraklion, Greece
- Department of Biological Applications and Technology, University of Ioannina, Ioannina, Greece
| | | | - Gareth Lycett
- Vector Biology, Liverpool School of Tropical Medicine, Liverpool, UK
| | - Marion Morris
- Vector Biology, Liverpool School of Tropical Medicine, Liverpool, UK
| | - John Vontas
- Foundation for Research and Technology - Hellas (FORTH), Institute of Molecular Biology and Biotechnology, Heraklion, Greece
- Pesticide Science Laboratory, Department of Crop Science, Agricultural University of Athens, Athens, Greece
| | - Hilary Ranson
- Vector Biology, Liverpool School of Tropical Medicine, Liverpool, UK.
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Major KM, Brander SM. The Ecological and Evolutionary Implications of Pyrethroid Exposure: A New Perspective on Aquatic Ecotoxicity. THE HANDBOOK OF ENVIRONMENTAL CHEMISTRY 2020. [DOI: 10.1007/698_2019_432] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Bayili K, N’Do S, Yadav RS, Namountougou M, Ouattara A, Dabiré RK, Ouédraogo GA, Diabaté A. Experimental hut evaluation of DawaPlus 3.0 LN and DawaPlus 4.0 LN treated with deltamethrin and PBO against free-flying populations of Anopheles gambiae s.l. in Vallée du Kou, Burkina Faso. PLoS One 2019; 14:e0226191. [PMID: 31869350 PMCID: PMC6927612 DOI: 10.1371/journal.pone.0226191] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2019] [Accepted: 11/21/2019] [Indexed: 11/18/2022] Open
Abstract
Background In view of widespread pyrethroid resistance in malaria vectors in Africa, two long-lasting insecticidal nets (LLINs) incorporated with a synergist, piperonyl butoxide (PBO), DawaPlus 3.0 (deltamethrin + PBO in the roof panel; deltamethrin alone in the side panels) and DawaPlus 4.0 (deltamethrin + PBO in all panels), were evaluated in an experimental hut trial in a rice growing irrigated area in Burkina Faso. Efficacy of nets was tested against free-flying malaria vector, Anopheles gambiae s.l., with high pyrethroid resistance involving L1014F kdr and CYP6P3P450 resistance mechanisms. Methodology The efficacy of unwashed and 20-times washed DawaPlus 3.0 (polyethylene roof panel with 120 mg/m2 deltamethrin and 440 mg/m2 PBO; polyester side panels with deltamethrin 100 mg/m2) and DawaPlus 4.0 (same composition as roof of DawaPlus 3.0) was evaluated against DawaPlus 2.0 (80 mg/m2 deltamethrin; positive control). Volunteer sleepers and treatments were rotated in huts using a Latin square design on 63 consecutive nights during August–October 2016. Mortality, human blood-feeding inhibition, deterrence and exit rates of An. gambiae s.l. were monitored. Principal findings Significantly higher rates of mortality and blood-feeding inhibition were observed with unwashed DawaPlus 4.0 (36%; 47.5%) than unwashed DawaPlus 3.0 (11.8%; 33.3%), DawaPlus 2.0 (4.3%; 6.4%) or untreated net (P < 0.05). Washing reduced personal protective efficacy yet PBO-LLINs were more protective and both met the WHO criteria. Conclusions The PBO-containing DawaPlus 4.0 significantly protected against An. gambiae s.l. in the study area. Unwashed DawaPlus 3.0 gave low to moderate protection against the positive control. PBO inhibits oxidase action; hence in areas with active malaria transmission having oxidase mechanisms, PBO nets could confer additional personal protection.
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Affiliation(s)
- Koama Bayili
- Institut de Recherche en Sciences de la Santé/Centre Muraz, Bobo-Dioulasso, Burkina Faso
- Université Nazi Boni, Bobo-Dioulasso, Burkina Faso
- * E-mail: (KB); (AD)
| | - Sévérin N’Do
- Institut de Recherche en Sciences de la Santé/Centre Muraz, Bobo-Dioulasso, Burkina Faso
| | - Rajpal S. Yadav
- Vector Ecology and Management, Department of Control of Neglected Tropical Diseases, World Health Organization, Geneva, Switzerland
| | - Moussa Namountougou
- Institut de Recherche en Sciences de la Santé/Centre Muraz, Bobo-Dioulasso, Burkina Faso
- Université Nazi Boni, Bobo-Dioulasso, Burkina Faso
| | - Abdoulaye Ouattara
- Institut de Recherche en Sciences de la Santé/Centre Muraz, Bobo-Dioulasso, Burkina Faso
| | - Roch K. Dabiré
- Institut de Recherche en Sciences de la Santé/Centre Muraz, Bobo-Dioulasso, Burkina Faso
| | | | - Abdoulaye Diabaté
- Institut de Recherche en Sciences de la Santé/Centre Muraz, Bobo-Dioulasso, Burkina Faso
- * E-mail: (KB); (AD)
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Bacterial communities associated with the midgut microbiota of wild Anopheles gambiae complex in Burkina Faso. Mol Biol Rep 2019; 47:211-224. [PMID: 31643044 DOI: 10.1007/s11033-019-05121-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Accepted: 10/09/2019] [Indexed: 10/25/2022]
Abstract
Plasmodium falciparum is transmitted by mosquitoes from the Anopheles gambiae sensu lato (s.l) species complex and is responsible for severe forms of malaria. The composition of the mosquitoes' microbiota plays a role in P. falciparum transmission, so we studied midgut bacterial communities of An. gambiae s.l from Burkina Faso. DNA was extracted from 17 pools of midgut of mosquitoes from the Anopheles gambiae complex from six localities in three climatic areas, including cotton-growing and cotton-free localities to include potential differences in insecticide selection pressure. The v3-v4 region of the 16S rRNA gene was targeted and sequenced using Illumina Miseq (2 × 250 nt). Diversity analysis was performed using QIIME and R software programs. The major bacterial phylum was Proteobacteria (97.2%) in all samples. The most abundant genera were Enterobacter (32.8%) and Aeromonas (29.8%), followed by Pseudomonas (11.8%), Acinetobacter (5.9%) and Thorsellia (2.2%). No statistical difference in operational taxonomic units (OTUs) was found (Kruskal-Wallis FDR-p > 0.05) among the different areas, fields or localities. Richness and diversity indexes (observed OTUs, Chao1, Simpson and Shannon indexes) showed significant differences in the cotton-growing fields and in the agroclimatic zones, mainly in the Sudano-Sahelian area. OTUs from seven bacterial species that mediate refractoriness to Plasmodium infection in An. gambiae s.l were detected. The beta diversity analysis did not show any significant difference. Therefore, a same control strategy of using bacterial species refractoriness to Plasmodium to target mosquito midgut bacterial community and affect their fitness in malaria transmission may be valuable tool for future malaria control efforts in Burkina Faso.
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Martin SL, Parent JS, Laforest M, Page E, Kreiner JM, James T. Population Genomic Approaches for Weed Science. PLANTS (BASEL, SWITZERLAND) 2019; 8:E354. [PMID: 31546893 PMCID: PMC6783936 DOI: 10.3390/plants8090354] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/16/2019] [Revised: 09/12/2019] [Accepted: 09/14/2019] [Indexed: 12/16/2022]
Abstract
Genomic approaches are opening avenues for understanding all aspects of biological life, especially as they begin to be applied to multiple individuals and populations. However, these approaches typically depend on the availability of a sequenced genome for the species of interest. While the number of genomes being sequenced is exploding, one group that has lagged behind are weeds. Although the power of genomic approaches for weed science has been recognized, what is needed to implement these approaches is unfamiliar to many weed scientists. In this review we attempt to address this problem by providing a primer on genome sequencing and provide examples of how genomics can help answer key questions in weed science such as: (1) Where do agricultural weeds come from; (2) what genes underlie herbicide resistance; and, more speculatively, (3) can we alter weed populations to make them easier to control? This review is intended as an introduction to orient weed scientists who are thinking about initiating genome sequencing projects to better understand weed populations, to highlight recent publications that illustrate the potential for these methods, and to provide direction to key tools and literature that will facilitate the development and execution of weed genomic projects.
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Affiliation(s)
- Sara L Martin
- Ottawa Research and Development Centre, Agriculture and Agri-Food Canada, Ottawa, ON K1A 0C6, Canada.
| | - Jean-Sebastien Parent
- Ottawa Research and Development Centre, Agriculture and Agri-Food Canada, Ottawa, ON K1A 0C6, Canada.
| | - Martin Laforest
- Saint-Jean-sur-Richelieu Research and Development Centre, Agriculture and Agri-Food Canada, Saint-Jean-sur-Richelieu, QC J3B 3E6, Canada.
| | - Eric Page
- Harrow Research and Development Centre, Agriculture and Agri-Food Canada, Harrow, ON N0R 1G0, Canada.
| | - Julia M Kreiner
- Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, ON M5S 3B2, Canada.
| | - Tracey James
- Ottawa Research and Development Centre, Agriculture and Agri-Food Canada, Ottawa, ON K1A 0C6, Canada.
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Dambach P, Baernighausen T, Traoré I, Ouedraogo S, Sié A, Sauerborn R, Becker N, Louis VR. Reduction of malaria vector mosquitoes in a large-scale intervention trial in rural Burkina Faso using Bti based larval source management. Malar J 2019; 18:311. [PMID: 31521176 PMCID: PMC6744650 DOI: 10.1186/s12936-019-2951-3] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2019] [Accepted: 09/07/2019] [Indexed: 11/21/2022] Open
Abstract
Background Malaria remains one of the most important causes of morbidity and death in sub-Saharan Africa. Along with early diagnosis and treatment of malaria cases and intermittent preventive treatment in pregnancy (IPTp), vector control is an important tool in the reduction of new cases. Alongside the use of long-lasting insecticidal nets (LLINs) and indoor residual spraying (IRS), targeting the vector larvae with biological larvicides, such as Bacillus thuringiensis israelensis (Bti) is gaining importance as a means of reducing the number of mosquito larvae before they emerge to their adult stage. This study presents data corroborating the entomological impact of such an intervention in a rural African environment. Methods The study extended over 2 years and researched the impact of biological larviciding with Bti on malaria mosquitoes that were caught indoors and outdoors of houses using light traps. The achieved reductions in female Anopheles mosquitoes were calculated for two different larviciding choices using a regression model. Results In villages that received selective treatment of the most productive breeding sites, the number of female Anopheles spp. dropped by 61% (95% CI 54–66%) compared to the pre-intervention period. In villages in which all breeding sites were treated, the number of female Anopheles spp. was reduced by 70% (95% CI 64–74%) compared to the pre-intervention period. Conclusion It was shown that malaria vector abundance can be dramatically reduced through larviciding of breeding habitats and that, in many geographical settings, they are a viable addition to current malaria control measures.
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Affiliation(s)
- Peter Dambach
- Institute of Public Health, University Hospital Heidelberg, 69120, Heidelberg, Germany.
| | - Till Baernighausen
- Institute of Public Health, University Hospital Heidelberg, 69120, Heidelberg, Germany
| | - Issouf Traoré
- Centre de Recherche en Santé de Nouna, Nouna, Burkina Faso
| | | | - Ali Sié
- Centre de Recherche en Santé de Nouna, Nouna, Burkina Faso
| | - Rainer Sauerborn
- Institute of Public Health, University Hospital Heidelberg, 69120, Heidelberg, Germany
| | - Norbert Becker
- German Mosquito Control Association (KABS), 67346, Speyer, Germany
| | - Valérie R Louis
- Institute of Public Health, University Hospital Heidelberg, 69120, Heidelberg, Germany
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Thellier M, Simard F, Musset L, Cot M, Velut G, Kendjo E, Pradines B. Changes in malaria epidemiology in France and worldwide, 2000-2015. Med Mal Infect 2019; 50:99-112. [PMID: 31257063 DOI: 10.1016/j.medmal.2019.06.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2018] [Accepted: 06/11/2019] [Indexed: 12/15/2022]
Abstract
In 2015, 212 million new cases of malaria were reported, causing 429,000 deaths. The World Health Organization (WHO) estimated a 41% decrease in the number of new cases worldwide between 2000 and 2015. The number of deaths from malaria fell by 62% worldwide and by 71% in Africa. In mainland France, malaria is mainly imported by travelers or migrants from endemic areas, in particular sub-Saharan Africa (95%). In France, the number of imported malaria cases, mainly due to Plasmodium falciparum (85%), was estimated at about 82,000 for the period 2000-2015. Over the same period, 6,468 cases of malaria were reported in the French armed forces, of which 2,430 cases (37.6%) were considered as imported because occurring outside of endemic areas. The number of malaria cases also fell between 2000 and 2015 in Mayotte and French Guiana, a malaria transmission zone. Mayotte has entered the elimination of malaria with less than 15 cases per year. In French Guiana, between 300 and 500 cases have been reported annually in recent years. The decline in morbidity and mortality is usually attributed to vector control measures and improved access to effective treatments. However, the Anopheles mosquitoes that transmit the disease have developed resistance against most insecticides. Similarly, malaria parasites have developed resistance against most of the antimalarial drugs used as prevention or treatment, even the latest marketed combinations such as artemisinin-based combination therapies.
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Affiliation(s)
- M Thellier
- Service de parasitologie-mycologie, Centre national de référence du paludisme, hôpital Pitié-Salpêtrière, Assistance publique Hôpitaux de Paris, 47, boulevard de l'Hôpital, 75013 Paris, France; UMRS 1136, iPLESP, institut Pierre-Louis d'épidémiologie et de santé publique, Sorbonne université, 27, rue Chaligny, 75571 Paris 12, France; UPMC, faculté de médecine, Sorbonne université, université Pierre-et-Marie-Curie, 91, boulevard de l'Hôpital, 75013 Paris, France
| | - F Simard
- MIVEGEC, IRD-CNRS-university Montpellier, 911, avenue Agropolis, BP 64501, 34394 Montpellier, France
| | - L Musset
- Laboratoire de parasitologie, Centre collaborateur OMS pour la surveillance des résistances aux antipaludiques, institut Pasteur de la Guyane, 23, avenue Louis Pasteur, 97300 Cayenne, France; Centre national de référence du paludisme, institut Pasteur de la Guyane, 23, avenue Louis Pasteur, 97300 Cayenne, France
| | - M Cot
- UMR2016, unité Mère et enfant face aux infections tropicales, institut de recherche pour le développement, 4, avenue de l'Observatoire, 75006 Paris, France
| | - G Velut
- Centre d'épidémiologie et de santé publique des armées, GSBdD Marseille Aubagne, BP 40026, 13568 Marseille cedex 02, France; Direction interarmées du service de santé des armées, Quartier La Madeleine, 97306 Cayenne, France
| | - E Kendjo
- Service de parasitologie-mycologie, Centre national de référence du paludisme, hôpital Pitié-Salpêtrière, Assistance publique Hôpitaux de Paris, 47, boulevard de l'Hôpital, 75013 Paris, France; UMRS 1136, iPLESP, institut Pierre-Louis d'épidémiologie et de santé publique, Sorbonne université, 27, rue Chaligny, 75571 Paris 12, France; UPMC, faculté de médecine, Sorbonne université, université Pierre-et-Marie-Curie, 91, boulevard de l'Hôpital, 75013 Paris, France
| | - B Pradines
- Unité parasitologie et entomologie, institut de recherche biomédicale des armées, institut hospitalo-universitaire Méditerranée Infection, 19-21, boulevard Jean-Moulin, 13005 Marseille, France; Aix Marseille université, IRD, AP-HM, SSA, VITROME, institut hospitalo-universitaire Méditerranée Infection, 19-21, boulevard Jean-Moulin, 13005 Marseille, France; Institut hospitalo-universitaire Méditerranée Infection, 19-21, boulevard Jean-Moulin, 13005 Marseille, France; Centre national de référence du paludisme, institut hospitalo-universitaire Méditerranée Infection, 19-21, boulevard Jean-Moulin, 13005 Marseille, France.
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Traoré A, Badolo A, Guelbeogo MW, Sanou A, Viana M, Nelli L, Zongo S, Toé HK, Traoré AS, Ranson H, Sagnon N. Anopheline species composition and the 1014F-genotype in different ecological settings of Burkina Faso in relation to malaria transmission. Malar J 2019; 18:165. [PMID: 31068189 PMCID: PMC6507147 DOI: 10.1186/s12936-019-2789-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2018] [Accepted: 04/23/2019] [Indexed: 11/10/2022] Open
Abstract
Background A three-year longitudinal study was conducted in four sentinel sites from different ecological settings in Burkina Faso, between 2008 and 2010 to identify longitudinal changes in insecticide resistance within Anopheles gambiae complex species based on larval collection. During this study, adult mosquitoes were also collected indoor and outdoor using several methods of collection. The present study reports the diversity of malaria vectors and the 1014F-genotype from this adult collection and investigates the association between this 1014F-genotype and sporozoite rate. Methods Adult mosquitoes were collected from July to August (corresponding to the start of rainy season) and October to November (corresponding to the end of rainy season) over 3 years (2008–2010) at four sites across the country, using pyrethrum spray catches (PSC), exit traps and pit shelters. Anopheles gambiae complex mosquitoes were identified to species and genotyped for the L1014F kdr mutation by PCR using genomic DNA. The circumsporozoite antigen of Plasmodium falciparum was detected in mosquitoes using sandwich ELISA. Results Overall 9212 anopheline mosquitoes were collected during the study period. Of those, 6767 mosquitoes were identified as Anopheles gambiae sensu lato (s.l.). Anopheles arabiensis, Anopheles coluzzii, Anopheles gambiae and or Anopheles funestus were incriminated as vectors of P. falciparum in the study area with an average sporozoite rate of 5%, (95% CI 4.14–5.99%). The kdr1014F-genotype frequencies were 11.44% (95% CI 2.5–39.85%), 19.2% (95% CI 4.53–53.73%) and 89.9 (95% CI 63.14–97.45%), respectively for An. arabiensis, An. coluzzii and An. gambiae. The proportion of the 1014F-genotype varied between sporozoite-infected and uninfected An. gambiae s.l. group. There was no significant difference in the 1014F-genotype frequency between infected and uninfected mosquitoes. Conclusion The current study shows the diversity of malaria vectors and significant interaction between species composition and kdr1014F-genotype in An. gambiae complex mosquitoes from Burkina Faso. In this study, no associations were found between the 1014F-genotype and P. falciparum infection in the major malaria vector An. gambiae s.l. Electronic supplementary material The online version of this article (10.1186/s12936-019-2789-8) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Alphonse Traoré
- Centre National de Recherche et de Formation sur le Paludisme, 01 BP 2208, Ouagadougou 01, Burkina Faso. .,Laboratoire d'Entomologie Fondamentale et Appliquée, Université Ouaga1 Pr Joseph Ki-Zerbo, BP 7021, Ouagadougou 03, Burkina Faso.
| | - Athanase Badolo
- Centre National de Recherche et de Formation sur le Paludisme, 01 BP 2208, Ouagadougou 01, Burkina Faso.,Laboratoire d'Entomologie Fondamentale et Appliquée, Université Ouaga1 Pr Joseph Ki-Zerbo, BP 7021, Ouagadougou 03, Burkina Faso
| | - Moussa W Guelbeogo
- Centre National de Recherche et de Formation sur le Paludisme, 01 BP 2208, Ouagadougou 01, Burkina Faso
| | - Antoine Sanou
- Centre National de Recherche et de Formation sur le Paludisme, 01 BP 2208, Ouagadougou 01, Burkina Faso
| | - Mafalda Viana
- Institute of Biodiversity, Animal Health and Comparative Medicine, College of Medical, Veterinary and Life Sciences, University of Glasgow, University Avenue, Glasgow, G12 8QQ, UK
| | - Luca Nelli
- Institute of Biodiversity, Animal Health and Comparative Medicine, College of Medical, Veterinary and Life Sciences, University of Glasgow, University Avenue, Glasgow, G12 8QQ, UK
| | - Soumanaba Zongo
- Centre National de Recherche et de Formation sur le Paludisme, 01 BP 2208, Ouagadougou 01, Burkina Faso
| | - Hyacinthe K Toé
- Centre National de Recherche et de Formation sur le Paludisme, 01 BP 2208, Ouagadougou 01, Burkina Faso
| | - Alfred S Traoré
- Laboratoire d'Entomologie Fondamentale et Appliquée, Université Ouaga1 Pr Joseph Ki-Zerbo, BP 7021, Ouagadougou 03, Burkina Faso
| | - Hilary Ranson
- Department of Vector Biology, Liverpool School of Tropical Medicine, Pembroke Place, Liverpool, L3 5QA, UK
| | - N'Falé Sagnon
- Centre National de Recherche et de Formation sur le Paludisme, 01 BP 2208, Ouagadougou 01, Burkina Faso
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Introgression between Anopheles gambiae and Anopheles coluzzii in Burkina Faso and its associations with kdr resistance and Plasmodium infection. Malar J 2019; 18:127. [PMID: 30971230 PMCID: PMC6458625 DOI: 10.1186/s12936-019-2759-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2018] [Accepted: 04/01/2019] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Insecticide resistance in Anopheles coluzzii mosquitoes has become widespread throughout West Africa including in Burkina Faso. The insecticide resistance allele (kdr or L1014F) is a prime indicator that is highly correlated with phenotypic resistance in West Africa. Studies from Benin, Ghana and Mali have suggested that the source of the L1014F is introgression of the 2L divergence island via interspecific hybridization with Anopheles gambiae. The goal of this study was to characterize local mosquito populations in the Nouna Department, Burkina Faso with respect to: (i) the extent of introgression between An. coluzzii and An. gambiae, (ii) the frequency of the L1014F mutation and (iii) Plasmodium infection rates. METHODS A total of 95 mosquitoes were collected from ten sites surrounding Nouna town in Kossi Province, Burkina Faso in 2012. The species composition, the extent of introgression in An. coluzzii mosquitoes and their Plasmodium infection rates were identified with a modified version of the "Divergence Island SNP" (DIS) genotyping assay. RESULTS The mosquito collection contained 70.5% An. coluzzii, 89.3% of which carried a 3 Mb genomic region on the 2L chromosome with L1014F insecticide resistance mutation that was introgressed from An. gambiae. In addition, 22.4% in the introgressed An. coluzzii specimens were infected with Plasmodium falciparum, whereas none of the non-introgressed ("pure") An. coluzzii were infected. CONCLUSION This paper is the first report providing divergence island SNP genotypes for natural population of Burkina Faso and corresponding Plasmodium infection rates. These observations warrant further study and could have a major impact on future malaria control strategies in Burkina Faso.
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da Cruz DL, Paiva MHS, Guedes DRD, Alves J, Gómez LF, Ayres CFJ. Detection of alleles associated with resistance to chemical insecticide in the malaria vector Anopheles arabiensis in Santiago, Cabo Verde. Malar J 2019; 18:120. [PMID: 30953531 PMCID: PMC6451206 DOI: 10.1186/s12936-019-2757-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2018] [Accepted: 03/30/2019] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Mosquitoes of the Anopheles gambiae complex are the main malaria vectors worldwide. Due to the lack of a vaccine to prevent malaria, the principal way to reduce the impact of this disease relies on the use of chemical insecticides to control its vectors. However, the intensive use of such compounds has led to the emergence of insecticide resistance in several Anopheles populations in Africa. This study aimed to investigate the presence of resistance alleles in an Anopheles arabiensis population from the City of Praia, capital of the Archipelago Cabo Verde, one of the countries on the World Health Organization list of countries that are on a path to eliminate local transmission of malaria. METHODS Larvae from the Anopheles genus were collected using a one-pint dipper in three areas of City of Praia. Larvae were fed and maintained until the emergence of adult mosquitoes, and these were morphologically identified. In addition, molecular identification was performed using IGS markers and all An. arabiensis samples were subjected to PCR to screen for mutations associated to resistance in the Ace-1, Nav and GSTE2 genes. RESULTS From a total of 440 mosquitoes collected, 52.3% were morphologically identified as An. gambiae sensu lato (s.l.) and 46.7% as Anopheles pretoriensis. The molecular identification showed that 100% of the An. gambiae s.l. were An. arabiensis. The mutations G119S in the Ace-1 gene and L119F in the GSTE2 gene were screened but not found in any sample. However, sequencing analysis for GSTE2 revealed the presence of 37 haplotypes, 16 polymorphic sites and a high genetic diversity (π = 2.67). The L1014S mutation in the Nav (voltage-gated sodium channel gene) was detected at a frequency of 7.3%. CONCLUSION This is the first study to investigate the circulation of insecticide resistance alleles in An. arabiensis from Cabo Verde. The circulation of the L1014S allele in the population of An. arabiensis in the city of Praia suggests that pyrethroid resistance may arise, be quickly selected, and may affect the process of malaria elimination in Cabo Verde. Molecular monitoring of resistance should continue in order to guide the development of strategies to be used in vector control in the study region.
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Affiliation(s)
- Derciliano Lopes da Cruz
- Departamento de Entomologia, Instituto Aggeu Magalhães/Fundação Oswaldo Cruz (FIOCRUZ-PE), Av. Professor Moraes Rego s/n, Cidade Universitária, Recife, PE, 50670-420, Brazil
| | - Marcelo Henrique Santos Paiva
- Departamento de Entomologia, Instituto Aggeu Magalhães/Fundação Oswaldo Cruz (FIOCRUZ-PE), Av. Professor Moraes Rego s/n, Cidade Universitária, Recife, PE, 50670-420, Brazil.,Universidade Federal de Pernambuco, Centro Acadêmico do Agreste, Rodovia BR-104, km 59 - Nova Caruaru, Caruaru, PE, 55002-970, Brazil
| | - Duschinka Ribeiro Duarte Guedes
- Departamento de Entomologia, Instituto Aggeu Magalhães/Fundação Oswaldo Cruz (FIOCRUZ-PE), Av. Professor Moraes Rego s/n, Cidade Universitária, Recife, PE, 50670-420, Brazil
| | - Joana Alves
- Instituto Nacional de Saúde Pública/Ministério da Saúde, Largo do Desastre da Assistência, CP-719, Praia, Cabo Verde
| | - Lara Ferrero Gómez
- Universidade Jean Piaget (UniPiaget), Caixa Postal 775, Praia, Cabo Verde
| | - Constância Flávia Junqueira Ayres
- Departamento de Entomologia, Instituto Aggeu Magalhães/Fundação Oswaldo Cruz (FIOCRUZ-PE), Av. Professor Moraes Rego s/n, Cidade Universitária, Recife, PE, 50670-420, Brazil.
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Wangrawa DW, Badolo A, Ilboudo Z, Guelbéogo WM, Kiendrébeogo M, Nébié RCH, Sagnon N, Sanon A. Insecticidal Activity of Local Plants Essential Oils Against Laboratory and Field Strains of Anopheles gambiae s. l. (Diptera: Culicidae) From Burkina Faso. JOURNAL OF ECONOMIC ENTOMOLOGY 2018; 111:2844-2853. [PMID: 30281085 DOI: 10.1093/jee/toy276] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2018] [Indexed: 06/08/2023]
Abstract
The emergence and intensification of resistance to insecticides in malaria vector populations is the main obstacle to insecticide-based control efforts. The main objective of this study was to evaluate the larvicidal and adulticidal properties of the essential oils (EOs) of Ocimum canum, Hyptis suaveolens, Hyptis spicigera, and Lantana camara on field-collected, pyrethroids-resistant mosquitoes, local laboratory strains, and susceptible 'Kisumu' strain of Anopheles gambiae (Meigen) (Diptera: Culicidae) populations. Larvae and adults of these mosquitoes were challenged against four EOs. The mortality rates of larvae and adults were assessed 24 h after exposure to the EOs. Species identifications and detection of the L1014F and L1014S kdr mutations and the 1575Y super-kdr mutation were carried out using polymerase chain reaction on the pyrethroid-resistant mosquitoes from the field. EO compositions were analyzed by gas chromatography and mass spectrometry. Monoterpene hydrocarbons were the major components of H. suaveolens and H. spicigera EOs (49.8%) and (69.6%), respectively, whereas oxygenated monoterpenes (68.7%) were predominant in the O. canum EO. For L. camara, the component yields were variable, but it was the most effective EO against all strains. The LC50 values for the larvae were 7.73 and 25.63 ppm for the susceptible 'Kisumu' and resistant field strains, respectively. The LC50 for adults was 0.24% for the susceptible strain and 1.98% for the resistant strain. Molecular analysis confirmed the presence of L1014F and N1575Y mutations in resistant Anopheles arabiensis and Anopheles coluzzii mosquitoes from the field. Our results highlighted the potential of the EOs of local plants as insecticides against resistant and susceptible strains of An. gambiae populations.
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Affiliation(s)
- Dimitri Wendgida Wangrawa
- Laboratoire d'Entomologie Fondamentale et Appliquée, Université Ouaga I Pr Joseph, Ouagadougou, Burkina Faso
- Unité de Formation et de Recherches/Sciences et Technologies, Université Norbert ZONGO, Koudougou, Burkina Faso
| | - Athanase Badolo
- Laboratoire d'Entomologie Fondamentale et Appliquée, Université Ouaga I Pr Joseph, Ouagadougou, Burkina Faso
| | - Zakaria Ilboudo
- Laboratoire d'Entomologie Fondamentale et Appliquée, Université Ouaga I Pr Joseph, Ouagadougou, Burkina Faso
| | | | - Martin Kiendrébeogo
- Laboratoire de Biochimie et de Chimie Appliquée, Université Ouaga I Pr Joseph, Ouagadougou 03, Burkina Faso
| | | | - N'Falé Sagnon
- Centre National de Recherche et de Formation sur le Paludisme, Ouagadougou, Burkina Faso
| | - Antoine Sanon
- Laboratoire d'Entomologie Fondamentale et Appliquée, Université Ouaga I Pr Joseph, Ouagadougou, Burkina Faso
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Transcriptomic meta-signatures identified in Anopheles gambiae populations reveal previously undetected insecticide resistance mechanisms. Nat Commun 2018; 9:5282. [PMID: 30538253 PMCID: PMC6290077 DOI: 10.1038/s41467-018-07615-x] [Citation(s) in RCA: 66] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Accepted: 11/12/2018] [Indexed: 12/01/2022] Open
Abstract
Increasing insecticide resistance in malaria-transmitting vectors represents a public health threat, but underlying mechanisms are poorly understood. Here, a data integration approach is used to analyse transcriptomic data from comparisons of insecticide resistant and susceptible Anopheles populations from disparate geographical regions across the African continent. An unbiased, integrated analysis of this data confirms previously described resistance candidates but also identifies multiple novel genes involving alternative resistance mechanisms, including sequestration, and transcription factors regulating multiple downstream effector genes, which are validated by gene silencing. The integrated datasets can be interrogated with a bespoke Shiny R script, deployed as an interactive web-based application, that maps the expression of resistance candidates and identifies co-regulated transcripts that may give clues to the function of novel resistance-associated genes. Increasing insecticide resistance of mosquitoes represents a public health threat, and underlying mechanisms are poorly understood. Here, Ingham et al. identify putative insecticide resistance genes in Anopheles gambiae populations across Africa and develop a web-based application that maps their expression.
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