Composition of Anopheles species and bionomic characteristics over the peak malaria transmission season in Bandarban, Bangladesh

Malaria Journal

Research

Bernard L. Nahlen¹  Timothy A. Burton¹  Isabella Rodriguez¹  Neil F. Lobo¹  Wasif A. Khan²  Mohammad Shafiul Alam²  Rashidul Haque²  Ching Swe Phru²  Hasan Mohammad Al-Amin³ 

[1]Eck Institute for Global Health (EIGH), University of Notre Dame, Notre Dame, IN, USA

[2]International Centre for Diarrhoeal Disease Research Bangladesh (icddr,b), Dhaka, Bangladesh

[3]International Centre for Diarrhoeal Disease Research Bangladesh (icddr,b), Dhaka, Bangladesh

[4]Mosquito Control Laboratory, QIMR Berghofer Medical Research Institute, Brisbane, QLD, Australia

[5]School of Biological Sciences, University of Queensland, Brisbane, QLD, Australia

关键词: Anopheles;    Bionomics;    Human landing catch;    Light trap;    Bangladesh;   

DOI  :  10.1186/s12936-023-04614-2

 received in 2023-01-10, accepted in 2023-06-01,  发布年份 2023

来源: Springer

【 摘 要 】

BackgroundJoint efforts by government and non-government organizations have helped to reduce malaria in Bangladesh and set the country on a clear path to eventual malaria elimination. However, achieving that goal would be challenging without a comprehensive understanding of vector bionomics.MethodsTargeted capturing of Anopheles mosquitoes over a rainy season, utilizing specific sampling methods, including human landing catches (HLCs), CDC-light traps (CDC-LTs), and pyrethrum spray catches (PSCs) were aimed to characterize entomological drivers of transmission in four sites of Bandarban, Bangladesh.ResultsMolecular characterization of a subset of 4637 mosquitoes has demonstrated the presence of at least 17 species whose capture rates were representative of the rainy season. Species compositions and bionomic traits did not vary between sites with Anopheles maculatus having the highest landing rate by HLCs and Anopheles vagus having the highest capture rate with CDC-LTs. Interestingly, Anopheles species compositions and capture rates varied significantly (p < 0.05) for An. vagus, between HLCs and its often-used proxy—CDC-LTs- suggesting impacts on downstream analysis. CDC-LTs capture rates demonstrated differing compositions with indoor and outdoor biting rates. For example, Anopheles nigerrimus and Anopheles nivipes were more endophagic by HLCs and more exophagic by CDC-LTs. The use of a cow-baited CDC-LT also demonstrated significantly different results when compared to a human-baited CDC-LT considering the high degree of anthropophily in these species. The exception to both zoophily and indoor resting was An. vagus, which demonstrated both anthropophily and high resting rates indoors—pointing to this species being a possible primary vector at this site.ConclusionA diverse Anopheles fauna in Bandarban has been confirmed through molecular methods, highlighting the potential impact of sampling techniques. Given the complexity of the local ecosystem, a better understanding of mosquito behaviour and ecology is required to achieve the goal of malaria elimination in Bangladesh.

【 授权许可】

CC BY   
© The Author(s) 2023

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