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Galeana-Pizaña JM, Cruz-Bello GM, Caudillo-Cos CA, Jiménez-Ortega AD. Impact of deforestation and climate on spatio-temporal spread of dengue fever in Mexico. Spat Spatiotemporal Epidemiol 2024; 50:100679. [PMID: 39181607 DOI: 10.1016/j.sste.2024.100679] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/30/2023] [Revised: 07/19/2024] [Accepted: 07/29/2024] [Indexed: 08/27/2024]
Abstract
Dengue prevalence results from the interaction of multiple socio-environmental variables which influence its spread. This study investigates the impact of forest loss, precipitation, and temperature on dengue incidence in Mexico from 2010 to 2020 using a Bayesian hierarchical spatial model. Three temporal structures-AR1, RW1, and RW2-were compared, with RW2 showing superior performance. Findings indicate that a 1 % loss of municipal forest cover correlates with a 16.9 % increase in dengue risk. Temperature also significantly affects the vectors' ability to initiate and maintain outbreaks, highlighting the significant role of environmental factors. The research emphasizes the importance of multilevel modeling, finer temporal data resolution, and understanding deforestation causes to enhance the predictability and effectiveness of public health interventions. As dengue continues affecting global populations, particularly in tropical and subtropical regions, this study contributes insights, advocating for an integrated approach to health and environmental policy to mitigate the impact of vector-borne diseases.
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Affiliation(s)
- José Mauricio Galeana-Pizaña
- Centro de Investigación en Ciencias de Información Geoespacial (CentroGeo), Contoy 137, Lomas de Padierna, Tlalpan, 14240, Mexico City, Mexico
| | - Gustavo Manuel Cruz-Bello
- Department of Social Sciences, Universidad Autónoma Metropolitana Unidad Cuajimalpa, Av. Vasco de Quiroga 4871, Cuajimalpa, 05348, Mexico City, Mexico.
| | - Camilo Alberto Caudillo-Cos
- Centro de Investigación en Ciencias de Información Geoespacial (CentroGeo), Contoy 137, Lomas de Padierna, Tlalpan, 14240, Mexico City, Mexico
| | - Aldo Daniel Jiménez-Ortega
- Centro de Investigación en Ciencias de Información Geoespacial (CentroGeo), Contoy 137, Lomas de Padierna, Tlalpan, 14240, Mexico City, Mexico
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Hernández Bautista PF, Cabrera Gaytán DA, Santacruz Tinoco CE, Vallejos Parás A, Alvarado Yaah JE, Martínez Miguel B, Anguiano Hernández YM, Arriaga Nieto L, Moctezuma Paz A, Jaimes Betancourt L, Pérez Andrade Y, Orozco OC, Valle Alvarado G, Rivera Mahey MG. Retrospective Analysis of Severe Dengue by Dengue Virus Serotypes in a Population with Social Security, Mexico 2023. Viruses 2024; 16:769. [PMID: 38793650 PMCID: PMC11125731 DOI: 10.3390/v16050769] [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: 03/13/2024] [Revised: 05/06/2024] [Accepted: 05/11/2024] [Indexed: 05/26/2024] Open
Abstract
BACKGROUND Risk factors for severe dengue manifestations have been attributed to various factors, including specific serotypes, sex, and age. Mexico has seen the re-emergence of DENV-3, which has not circulated in a decade. OBJECTIVE To describe dengue serotypes by age, sex, and their association with disease severity in dengue-positive serum samples from epidemiological surveillance system units. MATERIALS AND METHODS A descriptive analysis was conducted to evaluate the frequency of dengue severity by sex, age, disease quarter, geographical location, and dengue virus serotypes. The study was conducted using laboratory samples from confirmed dengue cases through RT-qPCR from the epidemiological surveillance laboratory network of the Mexican Social Security Institute, Mexico. Simple frequencies and proportions were calculated using the z-test for proportional differences between groups. Bivariate analysis with adjusted Chi2 was performed, and binary logistic regression models were constructed using the forward Wald method considering the model's predictive capacity. The measure of association was the odds ratio, with 95% confidence intervals. Statistical significance was set to an alpha level of <0.05. RESULTS In 2023, 10,441 samples were processed for dengue RT-qPCR at the IMSS, with a predominance of serotype DENV-3 (64.4%). The samples were mostly from women (52.0%) and outpatient cases (63.3%). The distribution of dengue severity showed significant variations by age, with a lower proportion of severe cases in young children and a higher proportion in the 5- to 14-year-old group. Hospitalizations increased significantly with severity. Warm regions had more cases overall and severity. Cases were most frequent from July to September. While DENV-2 was associated with severity, DENV-4 was not. Binary regression identified higher risk in women, age extremes, and DENV-2, with an overall predictive model of 58.5%. CONCLUSIONS Women, age groups at the extremes of life, and the DENV-2 serotype presented severe risk of dengue in a population with social security in Mexico during 2023.
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Affiliation(s)
- Porfirio Felipe Hernández Bautista
- Coordinación de Calidad de Insumos y Laboratorios Especializados, Instituto Mexicano del Seguro Social, Ciudad de México 07760, Mexico; (P.F.H.B.); (C.E.S.T.); (J.E.A.Y.); (B.M.M.); (Y.M.A.H.)
| | - David Alejandro Cabrera Gaytán
- Coordinación de Calidad de Insumos y Laboratorios Especializados, Instituto Mexicano del Seguro Social, Ciudad de México 07760, Mexico; (P.F.H.B.); (C.E.S.T.); (J.E.A.Y.); (B.M.M.); (Y.M.A.H.)
| | - Clara Esperanza Santacruz Tinoco
- Coordinación de Calidad de Insumos y Laboratorios Especializados, Instituto Mexicano del Seguro Social, Ciudad de México 07760, Mexico; (P.F.H.B.); (C.E.S.T.); (J.E.A.Y.); (B.M.M.); (Y.M.A.H.)
| | - Alfonso Vallejos Parás
- Coordinación de Vigilancia Epidemiológica, Instituto Mexicano del Seguro Social, Ciudad de México 03100, Mexico; (L.A.N.); (Y.P.A.); (O.C.O.); (G.V.A.); (M.G.R.M.)
| | - Julio Elias Alvarado Yaah
- Coordinación de Calidad de Insumos y Laboratorios Especializados, Instituto Mexicano del Seguro Social, Ciudad de México 07760, Mexico; (P.F.H.B.); (C.E.S.T.); (J.E.A.Y.); (B.M.M.); (Y.M.A.H.)
| | - Bernardo Martínez Miguel
- Coordinación de Calidad de Insumos y Laboratorios Especializados, Instituto Mexicano del Seguro Social, Ciudad de México 07760, Mexico; (P.F.H.B.); (C.E.S.T.); (J.E.A.Y.); (B.M.M.); (Y.M.A.H.)
| | - Yu Mei Anguiano Hernández
- Coordinación de Calidad de Insumos y Laboratorios Especializados, Instituto Mexicano del Seguro Social, Ciudad de México 07760, Mexico; (P.F.H.B.); (C.E.S.T.); (J.E.A.Y.); (B.M.M.); (Y.M.A.H.)
| | - Lumumba Arriaga Nieto
- Coordinación de Vigilancia Epidemiológica, Instituto Mexicano del Seguro Social, Ciudad de México 03100, Mexico; (L.A.N.); (Y.P.A.); (O.C.O.); (G.V.A.); (M.G.R.M.)
| | - Alejandro Moctezuma Paz
- Coordinación de Investigación en Salud, Instituto Mexicano del Seguro Social, Ciudad de México 06720, Mexico;
| | - Leticia Jaimes Betancourt
- Unidad de Medicina Familiar No. 7, Instituto Mexicano del Seguro Social, Ciudad de México 14370, Mexico;
| | - Yadira Pérez Andrade
- Coordinación de Vigilancia Epidemiológica, Instituto Mexicano del Seguro Social, Ciudad de México 03100, Mexico; (L.A.N.); (Y.P.A.); (O.C.O.); (G.V.A.); (M.G.R.M.)
| | - Oscar Cruz Orozco
- Coordinación de Vigilancia Epidemiológica, Instituto Mexicano del Seguro Social, Ciudad de México 03100, Mexico; (L.A.N.); (Y.P.A.); (O.C.O.); (G.V.A.); (M.G.R.M.)
| | - Gabriel Valle Alvarado
- Coordinación de Vigilancia Epidemiológica, Instituto Mexicano del Seguro Social, Ciudad de México 03100, Mexico; (L.A.N.); (Y.P.A.); (O.C.O.); (G.V.A.); (M.G.R.M.)
| | - Mónica Grisel Rivera Mahey
- Coordinación de Vigilancia Epidemiológica, Instituto Mexicano del Seguro Social, Ciudad de México 03100, Mexico; (L.A.N.); (Y.P.A.); (O.C.O.); (G.V.A.); (M.G.R.M.)
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Paraná VC, Feitosa CA, da Silva GCS, Gois LL, Santos LA. Risk factors associated with severe dengue in Latin America: A systematic review and meta-analysis. Trop Med Int Health 2024; 29:173-191. [PMID: 38263345 DOI: 10.1111/tmi.13968] [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] [Indexed: 01/25/2024]
Abstract
OBJECTIVE Severe dengue is a significant health problem in Latin America, with children being the most affected. Understanding risk factors for severe dengue is crucial for enhancing patient care. Therefore, this study aims to systematically review the literature to identify the risk factors associated with severe dengue in Latin America through systematic review and meta-analysis. METHODS PubMed, SciELO, LILACS and EMBASE databases were used to search for eligible scientific articles for the review. The outcomes considered were symptoms of severe dengue, hospitalisation and death. The Joanna Briggs Institute Critical Appraisal Checklist was used to assess the quality of the studies. Data analysis was performed using STATA v 13.0 software. The degree of heterogeneity between studies was quantified using the I2 measure, and statistically significant results were defined as those with p values <0.05. RESULTS Of the 1876 articles screened, 47 articles were included in the systematic review and 45 articles were analysed through meta-analysis. Identified risk factors associated with severe dengue included secondary dengue infection, female sex, white or Caucasian ethnicity and specific signs and symptoms such as headache, myalgia and/or arthralgia, vomiting/nausea, abdominal pain or tenderness, diarrhoea, prostration, lethargy, fatigue or similar. For the death outcome, respiratory symptoms and age <18 years were identified as risk factors. On the other hand, in women, the diagnosis of positive tourniquet test, platelet count <100,000 per μL and symptoms of capillary fragility were associated with a lower probability of death. These data highlight the importance of early screening of patients, to identify possible haemorrhagic signs and reduce deaths from dengue. This study has limitations, including possible publication bias, heterogeneity of results and study design biases. CONCLUSION These findings are significant for shaping strategies, management approaches and identifying high-risk groups, which will help establish future guidelines.
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Affiliation(s)
- Victoria Cruz Paraná
- Bahiana School of Medicine and Public Health, Salvador, Bahia, Brazil
- Gonçalo Moniz Institute, Oswaldo Cruz Foundation, Salvador, Bahia, Brazil
| | | | | | - Luana Leandro Gois
- Bahiana School of Medicine and Public Health, Salvador, Bahia, Brazil
- Department of Biointeraction Sciences, Institute of Health Sciences, Federal University of Bahia, Salvador, Bahia, Brazil
| | - Luciane Amorim Santos
- Bahiana School of Medicine and Public Health, Salvador, Bahia, Brazil
- Gonçalo Moniz Institute, Oswaldo Cruz Foundation, Salvador, Bahia, Brazil
- Graduate Program in Health Sciences, College of Medicine of Bahia, Federal University of Bahia, Salvador, Bahia, Brazil
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Sturmberg J, Paul E, Van Damme W, Ridde V, Brown GW, Kalk A. The danger of the single storyline obfuscating the complexities of managing SARS-CoV-2/COVID-19. J Eval Clin Pract 2022; 28:1173-1186. [PMID: 34825442 DOI: 10.1111/jep.13640] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Revised: 11/11/2021] [Accepted: 11/12/2021] [Indexed: 12/15/2022]
Abstract
Chimamanda Ngozi Adichie showed how a single story is limited and thereby distorts the true nature of an issue. During this COVID-19 pandemic there have been, at least, three consecutive single stories-the 'lethal threat' story, followed by the 'economic threat' story, and finally the 'vaccine miracle' story. None of these single stories can convincingly and permanently capture the dynamics of the pandemic. This is because countries experienced different morbidity and mortality patterns, different socioeconomic disadvantage, age and vulnerability of population, timing and level of lockdown with economic variability, and, despite heavy promotion, vaccines were beset with a significant and variable degree of hesitancy. Lack of transparency, coherence and consistency of pandemic management-arising from holding on to single storylines-showed the global deficiency of public health policy and planning, an underfunding of (public) health and social services, and a growing distrust in governments' ability to manage crises effectively. Indeed, the global management has increased already large inequities, and little has been learnt to address the growing crises of more infectious and potentially more lethal virus mutations. Holding onto single stories prevents the necessary learnings to understand and manage the complexities of 'wicked' problems, whereas listening to the many stories provides insights and pathways to do so effectively as well as efficiently.
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Affiliation(s)
- Joachim Sturmberg
- Discipline of General Practice, College of Health, Medicine and Wellbeing, University of Newcastle, Newcastle, New South Wales, Australia.,Foundation President-International Society for Systems and Complexity Sciences for Health
| | - Elisabeth Paul
- School of Public Health, Université Libre de Bruxelles, Brussels, Belgium
| | - Wim Van Damme
- Department of Public Health, Institute of Tropical Medicine, Antwerp, Belgium
| | - Valery Ridde
- CEPED, Institute for Research on Sustainable Development (IRD), ERL INSERM SAGESUD, IRD-Université de Paris, Paris, France
| | - Garrett W Brown
- Colead-Global Health, School of Politics and International Studies (POLIS), University of Leeds, Leeds, UK
| | - Andreas Kalk
- Kinshasa Country Office, Deutsche Gesellschaft für Internationale Zusammenarbeit, Kinshasa, Democratic Republic of the Congo
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Foucambert P, Esbrand FD, Zafar S, Panthangi V, Cyril Kurupp AR, Raju A, Luthra G, Shahbaz M, Almatooq H, Khan S. Efficacy of Dengue Vaccines in the Prevention of Severe Dengue in Children: A Systematic Review. Cureus 2022; 14:e28916. [PMID: 36225478 PMCID: PMC9542041 DOI: 10.7759/cureus.28916] [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] [Received: 07/05/2022] [Accepted: 09/07/2022] [Indexed: 11/25/2022] Open
Abstract
Dengue is a vector-borne disease caused by the dengue virus (DENV) and is a major health concern worldwide, particularly in regions of endemic disease. Dengue usually presents as a self-limited febrile illness. In some cases, more severe forms with hemorrhage and shock can occur, and children are especially prone to develop it. These forms can be lethal without appropriate management, and no antiviral treatment exists today. In the absence of a curative treatment for dengue, its clinical prevention remains essential. One vaccine - the chimeric yellow fever-dengue-tetravalent dengue vaccine (CYD-TDV) - has been approved for use in some populations, and several others are currently in development, including Takeda's tetravalent dengue vaccine candidate (TAK-003). This study is a systematic review of the current literature realized to evaluate the efficacy of the dengue vaccines in preventing severe dengue in children. This review focuses on the vaccines CYD-TDV and TAK-003. This systematic review was conducted according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. PubMed, PubMed Central (PMC), Medical Literature Analysis and Retrieval System Online (MEDLINE), Cochrane Library, and Google Scholar were the databases used to find the relevant data. The articles were selected using specific inclusion and exclusion criteria, and quality appraisal was realized with standardized quality assessment tools. Overall, our study shows that the dengue vaccines CYD-TDV and TAK-003 confer protection against severe dengue in children. Some distinctions exist depending on the vaccine type, the age, and the dengue serostatus of patients. While demonstrating encouraging results, this review also emphasizes the need for more in-depth studies about the safety and efficacy of dengue vaccines.
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Haris A, Azeem M, Binyameen M. Mosquito Repellent Potential of Carpesium abrotanoides Essential Oil and Its Main Components Against a Dengue Vector, Aedes aegypti (Diptera: Culicidae). JOURNAL OF MEDICAL ENTOMOLOGY 2022; 59:801-809. [PMID: 35157071 DOI: 10.1093/jme/tjac009] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2021] [Indexed: 05/26/2023]
Abstract
Disease vectoring mosquitoes are a serious threat to humans. However, till today only few mosquito repellents have been identified. The current study was conducted to evaluate the repellent potential of Carpesium abrotanoides essential oil against Aedes aegypti females by human bait technique. Essential oil was extracted by steam distillation process while the identification of chemical constituents was carried out by gas chromatography-mass spectrometry. Time span repellent bioassays of C. abrotanoides essential oil in comparison to DEET were performed at three different doses (33 μg/cm2, 165 μg/cm2, and 330 μg/cm2) under laboratory conditions. Highest repellency periods for essential oil and DEET were observed at the tested dose of 330 μg/cm2 with 315 min and 720 min, respectively. Lowest repellency period of 45 min for essential oil and 105 min for DEET was recorded at the tested dose of 33 μg/cm2. Major constituents caryophyllene (24.3%) and trans-nerolidol (12.0%) of C. abrotanoides essential oil were also evaluated as repellents at three different doses (330 μg/cm2, 165 μg/cm2, and 33 μg/cm2) against Ae. aegypti. Surprisingly, trans-nerolidol completely inhibited Ae. aegypti landings for 45 min when tested at 330 μg/cm2. However, caryophyllene did not completely inhibit Ae. aegypti landing even after immediate application at the tested dose of 330 μg/cm2. At the tested dose of 330 μg/cm2, the mixture (trans-nerolidol + caryophyllene) completely inhibited Ae. aegypti landing for 60 min indicating the synergistic effect of caryophyllene. Hence, C. abrotanoides as well as its major constituent, especially trans-nerolidol, have potential to formulate as mosquito repellent comparable of DEET.
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Affiliation(s)
- Abdullah Haris
- Department of Entomology, Faculty of Agricultural Sciences and Technology, Bahauddin Zakariya University, Multan, Pakistan
| | - Muhammad Azeem
- Department of Chemistry, COMSATS University Islamabad, Abbottabad Campus, Abbottabad, Pakistan
| | - Muhammad Binyameen
- Department of Entomology, Faculty of Agricultural Sciences and Technology, Bahauddin Zakariya University, Multan, Pakistan
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Is the role of forensic medicine in the covid-19 pandemic underestimated? Forensic Sci Med Pathol 2020; 17:136-138. [PMID: 32955718 PMCID: PMC7502652 DOI: 10.1007/s12024-020-00308-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/30/2020] [Indexed: 12/23/2022]
Abstract
We believe that forensic medicine should play a significant role in the COVID-19 pandemic. Forensic pathologists should ask and answer various questions through autopsy cases during the COVID-19 period, thus providing a significant contribution to science. Some of the potential roles of forensic medicine in this issue include: determining the exact cause of death among the deceased who were SARS-CoV-2 positive, contribution to the accuracy of mortality statistics, understanding pathological mechanisms of COVID-19, tracking the presence of the virus over time, survival of the virus after death as well as dealing with medicolegal issues. A detailed multidisciplinary analysis of autopsy samples would undoubtedly help understand this new illness and its clinical management. Therefore, autopsies during the COVID-19 pandemic should not be an exception, but certainly a rule.
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Stanojević M, Li K, Stamenković G, Ilić B, Paunović M, Pešić B, Maslovara IĐ, Šiljić M, Ćirković V, Zhang Y. Depicting the RNA Virome of Hematophagous Arthropods from Belgrade, Serbia. Viruses 2020; 12:v12090975. [PMID: 32887342 PMCID: PMC7552015 DOI: 10.3390/v12090975] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Revised: 08/26/2020] [Accepted: 08/28/2020] [Indexed: 01/21/2023] Open
Abstract
Hematophagous arthropods are important vectors for zoonotic pathogens. To date, a huge number of viruses have been identified in these arthropods, with a considerable proportion of them being human pathogens. However, the viromes of hematophagous arthropods are still largely unresearched. In this study, a number of arthropods were collected from Belgrade, Serbia including mosquitoes, ticks and bedbugs. The viromes of these arthropods were identified and characterized using Illumina MiSeq sequencing. In total, 21 viruses belonging to 11 families were characterized, with 11 of them representing novel species. These results may contribute to our knowledge of RNA viruses in arthropods and the discovery of novel human pathogens.
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Affiliation(s)
- Maja Stanojević
- Faculty of Medicine, Institute of Microbiology and Immunology, University of Belgrade, 11000 Belgrade, Serbia; (M.S.); (M.Š.); (V.C.)
| | - Kun Li
- Department of Zoonoses, National Institute for Communicable Disease Control and Prevention, Changping, Beijing 102206, China;
| | - Gorana Stamenković
- Department for Genetic Research, Institute for Biological Research “Siniša Stanković”—National Institute of Republic of Serbia, University of Belgrade, 11000 Belgrade, Serbia;
| | - Bojan Ilić
- Department of Animal Development, Faculty of Biology, Institute of Zoology, University of Belgrade, 11000 Belgrade, Serbia;
| | - Milan Paunović
- Natural History Museum in Belgrade, 11000 Belgrade, Serbia;
| | - Branislav Pešić
- Institute for Biocides and Medical Ecology, 11000 Belgrade, Serbia; (B.P.); (I.Đ.M.)
| | - Ivana Đurić Maslovara
- Institute for Biocides and Medical Ecology, 11000 Belgrade, Serbia; (B.P.); (I.Đ.M.)
| | - Marina Šiljić
- Faculty of Medicine, Institute of Microbiology and Immunology, University of Belgrade, 11000 Belgrade, Serbia; (M.S.); (M.Š.); (V.C.)
| | - Valentina Ćirković
- Faculty of Medicine, Institute of Microbiology and Immunology, University of Belgrade, 11000 Belgrade, Serbia; (M.S.); (M.Š.); (V.C.)
| | - Yongzhen Zhang
- Department of Zoonoses, National Institute for Communicable Disease Control and Prevention, Changping, Beijing 102206, China;
- Shanghai Public Health Clinical Center & Institute of Biomedical Sciences, Fudan University, Shanghai 200432, China
- Correspondence:
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Huang EYY, Wong AYP, Lee IHT, Qu Z, Yip HY, Leung CW, Yin SM, Hui JHL. Infection patterns of dengue, Zika and endosymbiont Wolbachia in the mosquito Aedes albopictus in Hong Kong. Parasit Vectors 2020; 13:361. [PMID: 32690078 PMCID: PMC7372788 DOI: 10.1186/s13071-020-04231-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Accepted: 07/15/2020] [Indexed: 12/16/2022] Open
Abstract
BACKGROUND The mosquito Aedes albopictus is a vector of dengue and Zika viruses. Insecticide-resistant mosquito populations have evolved in recent decades, suggesting that new control strategies are needed. Hong Kong has a monsoon-influenced humid subtropical climate, which favours the spread of mosquitoes. However, baseline information on the composition and dynamics of the occurrence of endosymbiont Wolbachia in local Ae. albopictus is lacking, hindering the development of scientifically-informed control measures. This study identifies the presence and absence of dengue and Zika viruses, and Wolbachia infection in Aedes albopictus in Hong Kong. METHODS Oviposition traps were set at 57 areas in Hong Kong, and both immature and adult mosquitoes were collected on a monthly basis between April 2018 and April 2019 as the study sample. Each individual mosquito in this sample was processed and screened for the presence of the dengue and Zika viruses and the endosymbionts Wolbachia wAlbA and wAlbB with PCR. RESULTS Totals of 967 and 984 mosquitoes were tested respectively for the presence of dengue and Zika viruses, and no trace of either infection was found in these samples. The presence of wAlbA and wAlbB was also tested in 1582 individuals. Over 80% of these individuals were found to be stably infected with Wolbachia throughout the thirteen-month collection period (~ 47% singly-infected; ~ 36.8% doubly infected with both wAlbA and wAlbB). CONCLUSIONS The high degree of Wolbachia wAlbA and wAlbB infection in Ae. albopictus mosquitoes in Hong Kong, coupled with the absence of any signs of infection by dengue and Zika viruses, contrasts significantly with the pattern of mosquito infection in other parts of Asia. Further studies of the infection pattern in local mosquitoes are warranted before mosquito control strategies used in other regions are implemented in Hong Kong.
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Affiliation(s)
- Elaine Y. Y. Huang
- School of Life Sciences, Simon F.S. Li Marine Science Laboratory, Key Laboratory of Agrobiotechnology, The Chinese University of Hong Kong, Hong Kong, China
| | - Annette Y. P. Wong
- School of Life Sciences, Simon F.S. Li Marine Science Laboratory, Key Laboratory of Agrobiotechnology, The Chinese University of Hong Kong, Hong Kong, China
| | - Ivy H. T. Lee
- School of Life Sciences, Simon F.S. Li Marine Science Laboratory, Key Laboratory of Agrobiotechnology, The Chinese University of Hong Kong, Hong Kong, China
| | - Zhe Qu
- School of Life Sciences, Simon F.S. Li Marine Science Laboratory, Key Laboratory of Agrobiotechnology, The Chinese University of Hong Kong, Hong Kong, China
| | - Ho Yin Yip
- School of Life Sciences, Simon F.S. Li Marine Science Laboratory, Key Laboratory of Agrobiotechnology, The Chinese University of Hong Kong, Hong Kong, China
| | - Chi-wah Leung
- Pest Control Advisory Section, Food and Environmental Hygiene Department, The Government of the Hong Kong Special Administrative Region (HKSAR), Hong Kong, China
| | - Shuk-may Yin
- Pest Control Advisory Section, Food and Environmental Hygiene Department, The Government of the Hong Kong Special Administrative Region (HKSAR), Hong Kong, China
| | - Jerome H. L. Hui
- School of Life Sciences, Simon F.S. Li Marine Science Laboratory, Key Laboratory of Agrobiotechnology, The Chinese University of Hong Kong, Hong Kong, China
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Byard RW. A forensic evaluation of plague - a re-emerging infectious disease with biowarfare potential. MEDICINE, SCIENCE, AND THE LAW 2020; 60:200-205. [PMID: 32192402 DOI: 10.1177/0025802420908483] [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] [Indexed: 06/10/2023]
Abstract
Plague is an acute infectious disease caused by the gram-negative cocco-bacillus Yersinia pestis. It has been responsible for 200 million deaths throughout history with three major pandemics. There are three forms: bubonic, septicaemic and pneumonic, each carrying a significant mortality rate. The usual transmission is from fleas carried by rodents. Recently, it has been listed as one of the reemerging infectious diseases globally, with a potential use in bioterrorism. At autopsy there may be lymphadenopathy, fulminant pneumonia or diffuse interstitial pneumonitis. However any organ may be affected with myocarditis, meningitis, pharyngitis and hepatic and splenic necrosis. The lethality of plague with the resurgence in numbers of cases, development of antibiotic resistance, recent occurrence in urban areas and the lack of a vaccine make it a disease not to be missed in the mortuary.
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Affiliation(s)
- Roger W Byard
- School of Medicine, The University of Adelaide, Australia
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Stephenson L, Byard RW. An atlas overview of characteristic features of tuberculosis that may be encountered at autopsy. Forensic Sci Med Pathol 2019; 16:143-151. [PMID: 31471869 DOI: 10.1007/s12024-019-00161-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/13/2019] [Indexed: 11/29/2022]
Abstract
Tuberculosis (TB) is a bacterial infection caused by Mycobacterium tuberculosis. Although primarily a disease of the respiratory system it may be found in any organ or tissue. Global population movements and the emergence of resistant strains are contributing to increasing numbers of cases in certain populations. Subtlety of symptoms and signs, chronicity of disease and failure to seek medical assistance may result in the diagnosis only being made at the time of autopsy. For this reason forensic pathologists need to understand the protean manifestations of the disease and the variable mechanisms by which TB may cause death. This atlas overview provides descriptions of the pathological manifestations of TB in a variety of organs with accompanying illustrations. It serves as a summary of conditions that should be checked for at autopsy in suspected or confirmed cases.
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Affiliation(s)
- Lilli Stephenson
- Forensic Science South Australia (FSSA) and the School of Medicine, The University of Adelaide, Level 2 Medical School North Building, Frome Road, Adelaide, South Australia, 5000, Australia
| | - Roger W Byard
- Forensic Science South Australia (FSSA) and the School of Medicine, The University of Adelaide, Level 2 Medical School North Building, Frome Road, Adelaide, South Australia, 5000, Australia.
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Niranjan R, Sumitha M, Sankari T, Muthukumaravel S, Jambulingam P. Nonstructural protein-1 (NS1) of dengue virus type-2 differentially stimulate expressions of matrix metalloproteinases in monocytes: protective effect of paracetamol. Int Immunopharmacol 2019; 73:270-279. [DOI: 10.1016/j.intimp.2019.05.022] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2019] [Revised: 05/06/2019] [Accepted: 05/10/2019] [Indexed: 12/12/2022]
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Lethal Dengue Virus Infection. Am J Forensic Med Pathol 2016; 37:221. [DOI: 10.1097/paf.0000000000000253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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