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Fisher PT, Keller K, Prichard RK. Investigating Dirofilaria immitis isolates infecting domestic canines and their susceptibility/resistance patterns to macrocyclic lactones in the northern region of the Mississippi Delta area (southeast Missouri). Vet Parasitol 2024; 329:110199. [PMID: 38781830 DOI: 10.1016/j.vetpar.2024.110199] [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: 11/29/2023] [Revised: 05/07/2024] [Accepted: 05/08/2024] [Indexed: 05/25/2024]
Abstract
Previous reports of macrocyclic lactone (ML) resistance in Dirofilaria immitis, the parasitic nematode which causes heartworm disease, have mainly been from the southern Mississippi Delta region. Southeast Missouri (SEMO), forming the northern boundary of this region, has not previously been well studied. The area is an ideal propagation region for heartworm infection and possibly for the spread of ML resistance. To assess whether D. immitis isolates infecting domestic canines in SEMO exhibit evidence of resistance to MLs, domestic canines, presented to veterinary facilities testing positive for heartworms through antigen and microfilariae (MF) examination, were utilized in the study. Using a descriptive epidemiological cross-sectional study, from March 2021 through February 2022, blood sample collection from 96 canines living in SEMO testing positive for heartworms were analyzed. MiSeq technology was utilized to sequence specific genetic markers associated with susceptibility/resistance for MLs in D. immitis isolates. Genomic data revealed most D. immitis isolates had genotypic profiles consistent with resistance to MLs. Of the 96 samples tested, 91 (94.8%) had a resistant genotype, 4 (4.2%) had a mixed genotype, and 1 sample (1%) genotyped as susceptible. While detailed and reliable medical histories were not available for most canines, detailed medical history from 2 canines indicated evidence of phenotypic resistance that was consistent with their genotypes. However, in vivo preventive tests are needed to confirm a high frequency of phenotypic ML resistance in D. immitis from this region. Increasing resistance patterns to MLs indicate the approach to heartworm prevention/treatment protocol should be reconsidered. New measures may be required to stop heartworm disease.
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Affiliation(s)
- Peggy T Fisher
- University of Missouri-College of Veterinary Medicine, 1520 East Rollins, Columbia, MO 65211, USA.
| | - Kathy Keller
- Institute of Parasitology, McGill University, 21111 Lakeshore Road, Sainte Anne de Bellevue, QC H9X3V9, Canada
| | - Roger K Prichard
- Institute of Parasitology, McGill University, 21111 Lakeshore Road, Sainte Anne de Bellevue, QC H9X3V9, Canada
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Napoli E, D'Amico G, Ramos RAN. Editorial: Dog filariosis: the threat walks not only in the blood stream. Front Vet Sci 2023; 10:1258004. [PMID: 37546335 PMCID: PMC10401595 DOI: 10.3389/fvets.2023.1258004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Accepted: 07/14/2023] [Indexed: 08/08/2023] Open
Affiliation(s)
- Ettore Napoli
- Department Veterinary Sciences, University of Messina, Messina, Italy
| | - Gianluca D'Amico
- Department of Parasitology and Parasitic Diseases, University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca, Cluj-Napoca, Romania
| | - Rafael Antonio Nascimento Ramos
- Laboratory of Parasitology, Federal University of the Agreste of Pernambuco, Garanhuns, Brazil
- Department of Veterinary Pathobiology, School of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX, United States
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McCall JW, DiCosty U, Mansour A, Fricks C, McCall S, Dzimianski MT, Carson B. Inability of Dirofilaria immitis infective larvae from mosquitoes fed on blood from microfilaremic dogs during low-dose and short-treatment regimens of doxycycline and ivermectin to complete normal development in heartworm naïve dogs. Parasit Vectors 2023; 16:199. [PMID: 37312202 DOI: 10.1186/s13071-023-05704-5] [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: 01/31/2023] [Accepted: 02/14/2023] [Indexed: 06/15/2023] Open
Abstract
BACKGROUND This study was conducted to determine whether heartworm infective larvae (L3) collected from mosquitoes fed on dogs during low-dose, short-treatment-regimen doxycycline and ivermectin could develop normally in dogs. METHODS Twelve Beagles in a separate study were infected with 10 pairs of adult male and female Dirofilaria immitis by IV transplantation and randomly allocated to three groups of four dogs. Starting on Day 0, Group 1 received doxycycline orally at 10 mg/kg sid for 30 days plus ivermectin (min., 6 mcg/kg) on Days 0 and 30; Group 2 received doxycycline orally at 10 mg/kg sid until individual dogs became microfilaria negative (72-98 doses) and ivermectin every other week for six to seven doses. These dogs served as microfilaremic blood donors for the current mosquito studies. Aedes aegypti were allowed to feed on group-pooled blood samples from treated Groups 1-M and 2-M and untreated control Group 3-M on Days 22 (Study M-A) and 42 (Study M-C) and from Groups 1-M and 2-M on Day 29 (Study M-B) after treatment was started. From the Day 22 mosquito feeding, two dogs in Groups 1-M and 2-M and one dog in Group 3-M were given 50 L3 by SC inoculation. From the Day 29 feeding, two dogs in Groups 1-M and 2-M were given 50 L3. From the Day 42 feeding, two dogs in Group 1-M received 30 L3, while two dogs in Group 2-M and one dog in Group 3-M received 40 L3. All 14 dogs were necropsied for recovery and enumeration of adult heartworms 163-183 days PI. RESULTS None of the 12 dogs that received L3 from mosquitoes fed on blood from treated dogs 22, 29 or 42 days after treatment started had any adult heartworms at necropsy, while the two control dogs had a total of 26 and 43 heartworms, respectively. CONCLUSIONS Treatment of microfilaremic dogs with doxycycline plus an ML, which later renders the L3 incapable of normal development in the animal host, widens the scope of the multimodal approach to heartworm prevention in reducing the spread of heartworm disease.
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Affiliation(s)
| | | | | | | | | | - Michael Timothy Dzimianski
- Department of Infectious Diseases, College of Veterinary Medicine, University of Georgia, Athens, GA, 30602, USA
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Napoli E, De Benedetto G, Ciuca L, Bosco A, Lia RP, Veneziano V, Bezerra Santos MA, Otranto D, Rinaldi L, Brianti E. New distribution patterns of Dirofilaria immitis in Italy. Front Vet Sci 2023; 10:1162403. [PMID: 37215465 PMCID: PMC10193386 DOI: 10.3389/fvets.2023.1162403] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Accepted: 03/24/2023] [Indexed: 05/24/2023] Open
Abstract
In recent decades, the number of autochthonous cases and foci of Dirofilaria immitis in dogs from southern regions has increased considerably, suggesting that the distribution of the species is not limited to northern Italian regions. This epidemiological picture emerges from case reports or studies in specific locations where outbreaks of heartworm disease have occasionally been reported together with the presence of mosquito vectors. To obtain a more comprehensive picture of the current distribution of D. immitis in southern Italy, a multicenter cross-sectional survey of canine filariasis was conducted. Owned and sheltered dogs (n = 1,987) were included in the survey regardless their breed, attitude and/or sex. All included dogs were older than 1 year and had no history of chemoprophylactic treatment against filarioses. A blood sample was collected from enrolled dogs and screened by modified Knott's test and, when positive, tested using D. immitis specific ELISA rapid test (SNAP 4DX, IDEXX). The overall microfilaremia prevalence was 17% (n = 338) being single-species infection (92.6%) more common that mixed (7.4%). Remarkably, D. immitis was the most frequent species detected with an overall prevalence of 11.4% (n = 227), followed by Dirofilaria repens (n = 74; 3.7%), and Acanthocheilonema reconditum (n = 12; 0.6%). Sheltered dogs were significantly more infected by D. immitis, as well as mongrel dogs and animals housed in rural areas. Data here reported indicate that D. immitis is largely present in southern Italy, raising awareness about the necessity of proper screening and chemoprophylactic treatments in exposed animals.
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Affiliation(s)
- Ettore Napoli
- Department of Veterinary Sciences, University of Messina, Messina, Italy
| | | | - Lavinia Ciuca
- Department of Veterinary Medicine and Animal Production, University of Napoli, Napoli, Italy
| | - Antonio Bosco
- Department of Veterinary Medicine and Animal Production, University of Napoli, Napoli, Italy
| | | | - Vincenzo Veneziano
- Department of Veterinary Medicine and Animal Production, University of Napoli, Napoli, Italy
| | | | - Domenico Otranto
- Department of Veterinary Medicine, University of Bari, Bari, Italy
- Faculty of Veterinary Sciences, Bu-Ali Sina University, Hamedan, Iran
| | - Laura Rinaldi
- Department of Veterinary Medicine, University of Bari, Bari, Italy
| | - Emanuele Brianti
- Department of Veterinary Sciences, University of Messina, Messina, Italy
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Noack S, Harrington J, Carithers DS, Kaminsky R, Selzer PM. Heartworm disease - Overview, intervention, and industry perspective. Int J Parasitol Drugs Drug Resist 2021; 16:65-89. [PMID: 34030109 PMCID: PMC8163879 DOI: 10.1016/j.ijpddr.2021.03.004] [Citation(s) in RCA: 42] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2021] [Revised: 03/26/2021] [Accepted: 03/30/2021] [Indexed: 02/06/2023]
Abstract
Dirofilaria immitis, also known as heartworm, is a major parasitic threat for dogs and cats around the world. Because of its impact on the health and welfare of companion animals, heartworm disease is of huge veterinary and economic importance especially in North America, Europe, Asia and Australia. Within the animal health market many different heartworm preventive products are available, all of which contain active components of the same drug class, the macrocyclic lactones. In addition to compliance issues, such as under-dosing or irregular treatment intervals, the occurrence of drug-resistant heartworms within the populations in the Mississippi River areas adds to the failure of preventive treatments. The objective of this review is to provide an overview of the disease, summarize the current disease control measures and highlight potential new avenues and best practices for treatment and prevention.
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Affiliation(s)
- Sandra Noack
- Boehringer Ingelheim Animal Health, Binger Str. 173, 55216, Ingelheim am Rhein, Germany
| | - John Harrington
- Boehringer Ingelheim Animal Health, 1730 Olympic Drive, 30601, Athens, GA, USA
| | - Douglas S Carithers
- Boehringer Ingelheim Animal Health, 3239 Satellite Blvd, 30096, Duluth, GA, USA
| | - Ronald Kaminsky
- paraC Consulting, Altenstein 13, 79685, Häg-Ehrsberg, Germany
| | - Paul M Selzer
- Boehringer Ingelheim Animal Health, Binger Str. 173, 55216, Ingelheim am Rhein, Germany.
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Otranto D, Dantas-Torres F, Fourie JJ, Lorusso V, Varloud M, Gradoni L, Drake J, Geurden T, Kaminsky R, Heckeroth AR, Schunack B, Pollmeier M, Beugnet F, Holdsworth P. World Association for the Advancement of Veterinary Parasitology (W.A.A.V.P.) guidelines for studies evaluating the efficacy of parasiticides in reducing the risk of vector-borne pathogen transmission in dogs and cats. Vet Parasitol 2021; 290:109369. [PMID: 33548595 DOI: 10.1016/j.vetpar.2021.109369] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2021] [Accepted: 01/19/2021] [Indexed: 01/04/2023]
Abstract
These guidelines are intended to provide an in-depth review of current knowledge and assist the planning and implementation of studies for evaluating the efficacy of parasiticides in reducing transmission of vector-borne pathogens (VBPs) to dogs and cats. At present, the prevention of VBP transmission in companion animals is generally achieved through the administration of products that can repel or rapidly kill arthropods, thus preventing or interrupting feeding before transmission occurs. The present guidelines complement existing guidelines, which focus on efficacy assessment of parasiticides for the treatment, prevention and control of flea and tick infestations, but also give guidance for studies focused on other vectors (i.e. mosquitoes and phlebotomine sand flies). The efficacy of parasiticides in reducing VBP transmission can be evaluated through laboratory or field studies. As such, the present guidelines provide recommendations for these studies, representing a tool for researchers, pharmaceutical companies and authorities involved in the research, development and registration of products with claims for reducing VBP transmission in dogs and cats, respecting the overall principles of the 3Rs (replacement, reduction and refinement). Gaps in our current understanding of VBP transmission times are herein highlighted and the need for further basic research on related topics is briefly discussed.
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Affiliation(s)
- Domenico Otranto
- Dipartimento di Medicina Veterinaria, Università degli Studi di Bari, 70010, Valenzano, Italy.
| | - Filipe Dantas-Torres
- Dipartimento di Medicina Veterinaria, Università degli Studi di Bari, 70010, Valenzano, Italy; Department of Immunology, Aggeu Magalhães Institute (Fiocruz-PE), Pernambuco, Brazil
| | | | - Vincenzo Lorusso
- Global Research and Intellectual Property, Vetoquinol, 37 Rue de la Victoire, 75009, Paris, France; School of Science, Engineering and Environment, Peel Building, University of Salford, Greater Manchester, M5 4WT, United Kingdom
| | | | - Luigi Gradoni
- Unit of Vector-Borne Diseases, Department of Infectious Diseases, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161, Rome, Italy
| | - Jason Drake
- Elanco Animal Health, 2500 Innovation Way, Greenfield, IN, 46140, USA
| | - Thomas Geurden
- Zoetis, Veterinary Medicine Research and Development, Hoge Wei 10, B-1930, Zaventem, Belgium
| | - Ronald Kaminsky
- ParaC-Consulting for Parasitology and Drug Discovery, 79685, Haeg-Ehrsberg, Germany
| | - Anja R Heckeroth
- MSD Animal Health Innovation GmbH, Zur Propstei, 55270, Schwabenheim, Germany
| | - Bettina Schunack
- Bayer Animal Health GmbH: an Elanco Animal Health Company, 51368, Leverkusen, Germany
| | - Matthias Pollmeier
- Bayer Animal Health GmbH: an Elanco Animal Health Company, 51368, Leverkusen, Germany
| | - Frédéric Beugnet
- Boehringer-Ingelheim Animal Health, 29 Av Tony Garnier, Lyon, 69007, France
| | - Peter Holdsworth
- PAH Consultancy Pty Ltd, Wanniassa, 2903, Canberra, ACT, Australia
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Effect of Dinotefuran, Permethrin, and Pyriproxyfen (Vectra ® 3D) on the Foraging and Blood-Feeding Behaviors of Aedes albopictus Using Laboratory Rodent Model. INSECTS 2020; 11:insects11080507. [PMID: 32764404 PMCID: PMC7469159 DOI: 10.3390/insects11080507] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/26/2020] [Revised: 08/03/2020] [Accepted: 08/04/2020] [Indexed: 02/07/2023]
Abstract
Simple Summary Tiger mosquito (Aedes albopictus) is a harmful vector involved in the transmission of several diseases to humans and their pets. Currently, several veterinary products are used to prevent pets against bites of arthropod vectors. However, there is no available information on the effect of these products on feeding and host choice behaviors of Aedes albopictus in the presence of treated and untreated hosts, as is the case of treated dogs present in close physical contact with their owners. The present study investigated the effect of a spot-on product (Vectra® 3D) on the feeding and host choice behaviours of Aedes albopictus when treated and untreated hosts are presents. Laboratory rodent model was performed to simulate the natural conditions. Rat and mouse hosts were alternately treated with Vectra® 3D and exposed simultaneously to starved mosquitoes. Results showed that Vectra® 3D-treated hosts are perfectly protected against up to 82% of mosquitoes. While up to 21% of mosquitoes were repelled from untreated hosts when these latter are present in close physical contact (30 cm) with treated ones suggesting an indirect protection that can allowed the protection of owners who treat their pets with Vectra® 3D. Abstract Dinotefuran-Permethrin-Pyriproxyfen (DPP) is used to kill and repel mosquitoes from dogs. However, the influence of the product on the host-seeking behavior of mosquitoes remains unknown. The interference of DPP with the host selection of unfed female Aedes albopictus was investigated. A total of 18 animals (9 mice and 9 rats) were divided into three groups of six animals each. DU: DPP treated rats (n = 3) with untreated mice (n = 3), UD: DPP treated mice (n = 3) with untreated rats (n = 3) and control UU: untreated mice (n = 3) and untreated rats (n = 3). In each group, the rats and mice were placed 30 cm apart. After sedation, the animals in each group were exposed twice (Day 1 and Day 7 post-treatment) for one hour to 71 ± 3 female mosquitoes. Mosquitoes were categorized after the 2-h post-exposure period as dead or alive. Blood-meal origin was determined from mosquitoes using a newly customized duplex qPCR. The highest values of forage ratio (1.36 ≥ wi ≤ 1.88) and selection index (0.63 ≥ Bi ≤ 0.94) for rat hosts indicates a preference of mosquitoes for this species as compared to mice when co-housed during the exposure. The mosquitoes only seldom fed on mice, even in the untreated group. The anti-feeding effect of DPP was therefore only assessed on rat’s hosts. The results showed that DPP, when directly applied on rats, provided a direct protection of 82% and 61% on Day 1 and Day 7, respectively, while when applied on mice hosts (UD), the DPP provided an indirect protection of 21% and 10% on Day 1 and Day 7, respectively. The results showed also that DPP, when applied on rats, provided a direct protection against Ae. albopictus bites. This effect did not result in increased exposure of the untreated host placed in the same cage at a distance of 30 cm.
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Hustedt JC, Boyce R, Bradley J, Hii J, Alexander N. Use of pyriproxyfen in control of Aedes mosquitoes: A systematic review. PLoS Negl Trop Dis 2020; 14:e0008205. [PMID: 32530915 PMCID: PMC7314096 DOI: 10.1371/journal.pntd.0008205] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2019] [Revised: 06/24/2020] [Accepted: 03/10/2020] [Indexed: 01/11/2023] Open
Abstract
Dengue is the most rapidly spreading arboviral disease in the world. The current lack of fully protective vaccines and clinical therapeutics creates an urgent need to identify more effective means of controlling Aedes mosquitos, principally Aedes aegypti, as the main vector of dengue. Pyriproxyfen (PPF) is an increasingly used hormone analogue that prevents juvenile Aedes mosquitoes from becoming adults and being incapable of transmitting dengue. The objectives of the review were to (1) Determine the effect of PPF on endpoints including percentage inhibition of emergence to adulthood, larval mortality, and resistance ratios; and (2) Determine the different uses, strengths, and limitations of PPF in control of Aedes. A systematic search was applied to Pubmed, EMBASE, Web of Science, LILACS, Global Health, and the Cochrane database of Systematic Reviews. Out of 1,369 records, 90 studies met the inclusion criteria. Nearly all fit in one of the following four categories 1) Efficacy of granules, 2) Auto-dissemination/horizontal transfer, 3) use of ultra-low volume thermal fogging (ULV), thermal fogging (TF), or fumigant technologies, and 4) assessing mosquito resistance. PPF granules had consistently efficacious results of 90-100% inhibition of emergence for up to 90 days. The evidence is less robust but promising regarding PPF dust for auto-dissemination and the use of PPF in ULV, TF and fumigants. Several studies also found that while mosquito populations were still susceptible to PPF, the lethal concentrations increased among temephos-resistant mosquitoes compared to reference strains. The evidence is strong that PPF does increase immature mortality and adult inhibition in settings represented in the included studies, however future research should focus on areas where there is less evidence (e.g. auto-dissemination, sprays) and new use cases for PPF. A better understanding of the biological mechanisms of cross-resistance between PPF, temephos, and other insecticides will allow control programs to make better informed decisions.
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Affiliation(s)
- John Christian Hustedt
- MRC Tropical Epidemiology Group, Department of Infectious Disease Epidemiology, London School of Hygiene and Tropical Medicine, London, United Kingdom
- Epidemiology Department, Malaria Consortium, London, United Kingdom
| | - Ross Boyce
- Department of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America
| | - John Bradley
- MRC Tropical Epidemiology Group, Department of Infectious Disease Epidemiology, London School of Hygiene and Tropical Medicine, London, United Kingdom
| | - Jeffrey Hii
- Epidemiology Department, Malaria Consortium, London, United Kingdom
| | - Neal Alexander
- MRC Tropical Epidemiology Group, Department of Infectious Disease Epidemiology, London School of Hygiene and Tropical Medicine, London, United Kingdom
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Lajeunesse MJ, Avello DA, Behrmann MS, Buschbacher TJ, Carey K, Carroll J, Chafin TJ, Elkott F, Faust AM, Fauver H, Figueroa GD, Flaig LL, Gauta SA, Gonzalez C, Graham RM, Hamdan K, Hanlon T, Hashami SN, Huynh D, Knaffl JL, Lanzas M, Libell NM, McCabe C, Metzger J, Mitchell I, Morales MA, Nayyar YR, Perkins A, Phan TA, Pidgeon NT, Ritter CL, Rosales VC, Santiago O, Stephens R, Taylor EJ, Thomas AJ, Yanez NE. Infected Mosquitoes Have Altered Behavior to Repellents: A Systematic Review and Meta-analysis. JOURNAL OF MEDICAL ENTOMOLOGY 2020; 57:542-550. [PMID: 31755530 DOI: 10.1093/jme/tjz209] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2019] [Indexed: 06/10/2023]
Abstract
Here we conducted a systematic review and meta-analysis to reach a consensus on whether infected and uninfected mosquitoes respond differently to repellents. After screening 2,316 published studies, theses, and conference abstracts, we identified 18 studies that tested whether infection status modulated the effectiveness of repellents. Thirteen of these studies had outcomes available for meta-analysis, and overall, seven repellents were tested (typically DEET with 62% of outcomes), six mosquito species had repellence behaviors measured (typically Aedes aegypti (L.) (Diptera: Culicidae) mosquitoes with 71% of outcomes), and a broad diversity of infections were tested including Sindbis virus (Togaviridae: Alphavirus) (33% of outcomes), Dengue (Flaviviridae: Flavivirus) (31%), malaria (Plasmodium berghei Vincke & Lips (Haemospororida: Plasmodiidae) or P. falciparum Welch (Haemospororida: Plasmodiidae); 25%), Zika (Flaviviridae: Flavivirus) (7%), and microsporidia (4%). Pooling all outcomes with meta-analysis, we found that repellents were less effective against infected mosquitoes-marking an average 62% reduction in protective efficacy relative to uninfected mosquitoes (pooled odds ratio = 0.38, 95% confidence interval = 0.22-0.66; k = 96). Older infected mosquitoes were also more likely to show altered responses and loss of sensitivity to repellents, emphasizing the challenge of distinguishing between age or incubation period effects. Plasmodium- or Dengue-infected mosquitoes also did not show altered responses to repellents; however, Dengue-mosquito systems used inoculation practices that can introduce variability in repellency responses. Given our findings that repellents offer less protection against infected mosquitoes and that these vectors are the most dangerous in terms of disease transmission, then trials on repellent effectiveness should incorporate infected mosquitoes to improve predictability in blocking vector-human contact.
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Affiliation(s)
- Marc J Lajeunesse
- Department of Integrative Biology, University of South Florida, Tampa, FL
| | - Daniel A Avello
- Department of Integrative Biology, University of South Florida, Tampa, FL
| | - Morgan S Behrmann
- Department of Integrative Biology, University of South Florida, Tampa, FL
| | | | - Kayla Carey
- Department of Integrative Biology, University of South Florida, Tampa, FL
| | - Jordyn Carroll
- Department of Integrative Biology, University of South Florida, Tampa, FL
| | - Timothy J Chafin
- Department of Integrative Biology, University of South Florida, Tampa, FL
| | - Fatima Elkott
- Department of Integrative Biology, University of South Florida, Tampa, FL
| | - Ami M Faust
- Department of Integrative Biology, University of South Florida, Tampa, FL
| | - Hope Fauver
- Department of Integrative Biology, University of South Florida, Tampa, FL
| | | | - Louisa L Flaig
- Department of Integrative Biology, University of South Florida, Tampa, FL
| | - Sarah A Gauta
- Department of Integrative Biology, University of South Florida, Tampa, FL
| | - Cristian Gonzalez
- Department of Integrative Biology, University of South Florida, Tampa, FL
| | - Rowan M Graham
- Department of Integrative Biology, University of South Florida, Tampa, FL
| | - Khalid Hamdan
- Department of Integrative Biology, University of South Florida, Tampa, FL
| | - Thomas Hanlon
- Department of Integrative Biology, University of South Florida, Tampa, FL
| | - Syad N Hashami
- Department of Integrative Biology, University of South Florida, Tampa, FL
| | - Dora Huynh
- Department of Integrative Biology, University of South Florida, Tampa, FL
| | - Jessica L Knaffl
- Department of Integrative Biology, University of South Florida, Tampa, FL
| | - Milton Lanzas
- Department of Integrative Biology, University of South Florida, Tampa, FL
| | - Nicole M Libell
- Department of Integrative Biology, University of South Florida, Tampa, FL
| | - Casey McCabe
- Department of Integrative Biology, University of South Florida, Tampa, FL
| | - Jamie Metzger
- Department of Integrative Biology, University of South Florida, Tampa, FL
| | - Isabella Mitchell
- Department of Integrative Biology, University of South Florida, Tampa, FL
| | - Marisol A Morales
- Department of Integrative Biology, University of South Florida, Tampa, FL
| | - Yogi R Nayyar
- Department of Integrative Biology, University of South Florida, Tampa, FL
| | - Aaron Perkins
- Department of Integrative Biology, University of South Florida, Tampa, FL
| | - Tam-Anh Phan
- Department of Integrative Biology, University of South Florida, Tampa, FL
| | - Nicholas T Pidgeon
- Department of Integrative Biology, University of South Florida, Tampa, FL
| | - Camryn L Ritter
- Department of Integrative Biology, University of South Florida, Tampa, FL
| | - Veronica C Rosales
- Department of Integrative Biology, University of South Florida, Tampa, FL
| | - Olivia Santiago
- Department of Integrative Biology, University of South Florida, Tampa, FL
| | - Rebecca Stephens
- Department of Integrative Biology, University of South Florida, Tampa, FL
| | - Ethan J Taylor
- Department of Integrative Biology, University of South Florida, Tampa, FL
| | - Anup J Thomas
- Department of Integrative Biology, University of South Florida, Tampa, FL
| | - Nicholas E Yanez
- Department of Integrative Biology, University of South Florida, Tampa, FL
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10
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Tahir D, Davoust B, Parola P. Vector-borne nematode diseases in pets and humans in the Mediterranean Basin: An update. Vet World 2019; 12:1630-1643. [PMID: 31849426 PMCID: PMC6868252 DOI: 10.14202/vetworld.2019.1630-1643] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2019] [Accepted: 09/09/2019] [Indexed: 01/16/2023] Open
Abstract
Vector-borne diseases (VBDs) are among the leading causes of morbidity and mortality in humans and animals. The scale of VBDs is increasing worldwide, including in the Mediterranean Basin, a region exposed to climate changes. Indeed, weather conditions may influence the abundance and distribution of vectors. The vector-borne nematode diseases of dogs and cats, such as dirofilariosis, onchocercosis, thelaziosis, Cercopithifilaria, and Acanthocheilonema infections, are some of these vectorized diseases, several of which are zoonoses. They are all caused by parasitic nematodes transmitted by arthropods, including mosquitoes (Dirofilaria spp.), black flies (Onchocerca lupi), drosophilids (Thelazia callipaeda), ticks (Acanthocheilonema dracunculoides and Cercopithifilaria bainae), and fleas and lice (Acanthocheilonema reconditum). The control and prevention of these infections and diseases require a multidisciplinary approach based on strengthening collaboration between the different actors in the fields of health, research, sociology, economics, governments and citizens, to improve human, animal, and ecosystem health. This is the concept of "one health." The review aimed to provide a general update on the spatial and temporal distribution of vector-borne nematodes diseases affecting companion animals and humans, as well as the vectors involved in the Mediterranean area. Simultaneously, certain epidemiological parameters, diagnosis, treatment, and control of these diseases based on the "one health" concept will also be discussed.
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Affiliation(s)
- Djamel Tahir
- Aix Marseille Univ, IRD, AP-HM, SSA, VITROME, Marseille, France.,Institut Hospitalo-Universitaire Méditerranée Infection, Marseille, France
| | - Bernard Davoust
- Institut Hospitalo-Universitaire Méditerranée Infection, Marseille, France.,Microbes Evolution Phylogeny and Infections, Aix Marseille Univ, Institut de Recherche pour le Développement, Assistance Publique-Hôpitaux de Marseille, Institut Hospitalo-Universitaire Méditerranée Infection, Marseille, France
| | - Philippe Parola
- Aix Marseille Univ, IRD, AP-HM, SSA, VITROME, Marseille, France.,Institut Hospitalo-Universitaire Méditerranée Infection, Marseille, France
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11
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McTier TL, Six RH, Pullins A, Chapin S, Kryda K, Mahabir SP, Woods DJ, Maeder SJ. Preventive efficacy of oral moxidectin at various doses and dosage regimens against macrocyclic lactone-resistant heartworm (Dirofilaria immitis) strains in dogs. Parasit Vectors 2019; 12:444. [PMID: 31506088 PMCID: PMC6737633 DOI: 10.1186/s13071-019-3685-3] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2019] [Accepted: 08/23/2019] [Indexed: 11/14/2022] Open
Abstract
Background Moxidectin has previously shown limited efficacy (≤ 44.4%) against confirmed macrocyclic lactone (ML)-resistant Dirofilaria immitis strains at 3 µg/kg after single and multiple oral dosages. Three studies were conducted to evaluate higher oral moxidectin doses for efficacy against confirmed ML-resistant D. immitis strains. Methods Dogs were inoculated with 50 D. immitis L3 and randomly allocated to treatments. Study 1: 6 groups of dogs (n = 8) were inoculated with JYD-34 (Day − 30) and treated as follows: T01, negative control; T02–T05, moxidectin at 3, 6, 12 or 24 µg/kg, respectively, on Day 0 only; T06, moxidectin at 3 µg/kg on Days 0, 30 and 60. Study 2: 10 groups of dogs (n = 5) were inoculated (Day − 30) with either JYD-34 (T01, T03–05) or ZoeLA (T02, T06–T10) and treated as follows: T01 and T02, negative controls; T03–T05, moxidectin at 24, 40 or 60 µg/kg, respectively, on Days 0, 28 and 56; T06 and T09, moxidectin at 3 or 60 µg/kg on Day 0 only; T07, T08 and T10, moxidectin at 24, 40 or 60 µg/kg, respectively, on Days 0, 28 and 56. Study 3: 5 groups of dogs (n = 5) were inoculated with ZoeMO (Day − 28) and treated as follows: T01, negative control; T02, moxidectin at 3 µg/kg moxidectin on Day 0 only; T03–T05, moxidectin at 24, 40 or 60 µg/kg, respectively, on Days 0, 28 and 56. All dogs were necropsied for adult heartworm recovery ~ 4–5 months post-inoculation. Results All moxidectin-treated dogs showed significantly lower worm counts than controls. The efficacy of moxidectin administered once at 3 µg/kg was 19% (JYD-34), 44.4% (ZoeLA) and 82.1% (ZoeMO). Increasing both the dose and the number of dosages of moxidectin improved efficacy, with 100% protection obtained using three dosages of moxidectin at either 40 µg/kg (JYD-34, ZoeMO) or 60 µg/kg (ZoeLA). Three dosages of 24 µg/kg were also highly effective, providing ≥ 98.8% efficacy for all three strains. Conclusions Increasing both the dose and number of consecutive monthly dosages of moxidectin improved the efficacy against ML-resistant heartworms. Based on these data and other technical considerations, the 24 µg/kg dose was considered the optimal dose for further commercial development.
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Affiliation(s)
- Tom L McTier
- Zoetis, Veterinary Medicine Research and Development, 333 Portage St, Kalamazoo, MI, 49007, USA.
| | - Robert H Six
- Zoetis, Veterinary Medicine Research and Development, 333 Portage St, Kalamazoo, MI, 49007, USA
| | - Aleah Pullins
- Zoetis, Veterinary Medicine Research and Development, 333 Portage St, Kalamazoo, MI, 49007, USA
| | - Sara Chapin
- Zoetis, Veterinary Medicine Research and Development, 333 Portage St, Kalamazoo, MI, 49007, USA
| | - Kristina Kryda
- Zoetis, Veterinary Medicine Research and Development, 333 Portage St, Kalamazoo, MI, 49007, USA
| | - Sean P Mahabir
- Zoetis, Veterinary Medicine Research and Development, 333 Portage St, Kalamazoo, MI, 49007, USA
| | - Debra J Woods
- Zoetis, Veterinary Medicine Research and Development, 333 Portage St, Kalamazoo, MI, 49007, USA
| | - Steven J Maeder
- Zoetis, Veterinary Medicine Research and Development, 333 Portage St, Kalamazoo, MI, 49007, USA
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McCall JW, Hodgkins E, Varloud M, Mansour A, DiCosty U. Blocking the transmission of heartworm (Dirofilaria immitis) to mosquitoes (Aedes aegypti) by weekly exposure for one month to microfilaremic dogs treated once topically with dinotefuran-permethrin-pyriproxyfen. Parasit Vectors 2017; 10:511. [PMID: 29143651 PMCID: PMC5688439 DOI: 10.1186/s13071-017-2439-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Background This study assessed the influence of a topical ectoparasiticide (dinotefuran-permethrin-pyriproxyfen, DPP, Vectra®3D, Ceva Animal Health) on the acquisition of heartworm microfilariae by mosquitoes exposed to microfilaremic dogs weekly for 1 month. Methods Six beagle dogs (9.2 ± 1.6 kg body weight) infected with Dirofilaria immitis were allocated to two groups of three dogs: an untreated control group and a DPP-treated group. Dogs were treated on Day 0 and exposed under sedation for 1 h to 80 ± 20 unfed Aedes aegypti. Each dog was exposed to mosquitoes released into mosquito-proof containers on Days −7 (pretreatment), 7, 14, 21 and 28. Up to 20 engorged mosquitoes were aspirated from the cage as soon as they were blood-fed. They were dissected and the blood from each midgut was stained for a microfilaria (MF) count. After each exposure, mosquitoes were classified as live, moribund or dead and engorged or nonengorged. The number of dead mosquitoes was recorded daily for 16 days, when the live mosquitoes were dissected to count the infective third-stage larvae (L3). Results Prior to treatment, 95% of the engorged mosquitoes in both groups had MF. After treatment, engorgement rates for the treated group were 0%, 2.3%, 2.7% and 2.2% for Days 7, 14, 21 and 28, respectively, with anti-feeding efficacy (repellency) of 100%, 98.0%, 95.8% and 97.0%, respectively. A total of 22 mosquitoes fed on treated dogs; most of them were dead within 24 h, and all were dead within 72 h. Only 2 unfed mosquitoes exposed to treated dogs survived the incubation period and no L3 were found in them. A total of 121 of the 132 (91.6%) surviving mosquitoes that had engorged on untreated dogs had an average of 12.3 L3 per mosquito (range, 0-39). Conclusions DPP was more than 95% effective in inhibiting blood-feeding and killing both engorged and nonengorged mosquitoes exposed weekly to microfilaremic dogs for 28 days after treatment. Treatment with DPP was completely effective in killing the few mosquitoes that fed on the treated dogs before they lived long enough for the microfilariae to develop to L3 and, consequently, was completely effective in blocking the transmission of L3 to other animals. DPP can break the life cycle of D. immitis and prevent infected dogs and infected mosquitoes from being effective reservoirs and can slow down the spread of heartworms, even those resistant to macrocyclic lactone preventives.
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Affiliation(s)
- John W McCall
- TRS Labs, 215 Paradise Boulevard, 30607, Athens, GA, USA.
| | - Elizabeth Hodgkins
- Ceva Santé Animale, 10 Avenue de la ballastière, 33500, Libourne, France
| | | | | | - Utami DiCosty
- TRS Labs, 215 Paradise Boulevard, 30607, Athens, GA, USA
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