Anopheles diversity, biting behaviour and transmission potential in forest and farm environments of Gia Lai province, Vietnam.

Autor: Van Dung N; National Institute of Malariology, Parasitology and Entomology, Hanoi, Vietnam. nguyenvandung@outlook.com., Thieu NQ; National Institute of Malariology, Parasitology and Entomology, Hanoi, Vietnam., Canh HD; National Institute of Malariology, Parasitology and Entomology, Hanoi, Vietnam., Le Duy B; National Institute of Malariology, Parasitology and Entomology, Hanoi, Vietnam., Hung VV; National Institute of Malariology, Parasitology and Entomology, Hanoi, Vietnam., Ngoc NTH; National Institute of Malariology, Parasitology and Entomology, Hanoi, Vietnam., Mai NVT; Health Poverty Action Vietnam, Hanoi, Vietnam., Van Anh NT; Health Poverty Action Vietnam, Hanoi, Vietnam., Son LD; Health Poverty Action Vietnam, Hanoi, Vietnam., Oo WH; Health Security Program, Burnet Institute Myanmar, Yangon, Myanmar., Htike W; Health Security Program, Burnet Institute Myanmar, Yangon, Myanmar., Oo MC; Health Security Program, Burnet Institute Myanmar, Yangon, Myanmar., Galau NH; Health Security Program, Burnet Institute Myanmar, Yangon, Myanmar., Thu KM; Health Security Program, Burnet Institute Myanmar, Yangon, Myanmar., Zaw AK; Health Security Program, Burnet Institute Myanmar, Yangon, Myanmar., Htwe EP; Health Security Program, Burnet Institute Myanmar, Yangon, Myanmar., Cutts JC; Disease Elimination Program, Burnet Institute, Melbourne, Australia.; Department of Medicine, The University of Melbourne, Melbourne, Australia., Kearney EA; Disease Elimination Program, Burnet Institute, Melbourne, Australia.; Melbourne School of Population and Global Health, The University of Melbourne, Melbourne, Australia., Wang B; Health Poverty Action, London, UK., Agius PA; Disease Elimination Program, Burnet Institute, Melbourne, Australia.; Melbourne School of Population and Global Health, The University of Melbourne, Melbourne, Australia.; Department of Epidemiology and Preventive Medicine, Monash University, Melbourne, Australia.; Biostatistics Unit, Faculty of Health, Deakin University, Melbourne, Australia., Fowkes FJI; Disease Elimination Program, Burnet Institute, Melbourne, Australia.; Melbourne School of Population and Global Health, The University of Melbourne, Melbourne, Australia.; Department of Epidemiology and Preventive Medicine, Monash University, Melbourne, Australia.; Department of Infectious Diseases, Monash University, Melbourne, Australia., O'Flaherty K; Disease Elimination Program, Burnet Institute, Melbourne, Australia. katherine.oflaherty@burnet.edu.au.
Jazyk: angličtina
Zdroj: Malaria journal [Malar J] 2023 Jul 05; Vol. 22 (1), pp. 204. Date of Electronic Publication: 2023 Jul 05.
DOI: 10.1186/s12936-023-04631-1
Abstrakt: Background: Despite recent reductions in Vietnam, malaria transmission persists in some areas in forests and farmlands where a high density of Anopheles mosquitoes relative to other environments occurs. To inform effective malaria control measures, it is important to understand vector bionomics and the malaria transmission role of Anopheles spp. in the highland regions of Vietnam. This study was conducted to quantify the abundance, composition and biting behaviour of the Anopheles mosquito population, and the proportion of Plasmodium spp. infected mosquitoes collected from forest and agricultural farm sites in Gia Lai province, Vietnam.
Methods: Forest and agricultural farm sites in Gia Lai province were selected for mosquito collections (total eight sites). Mosquito collection was performed by Human-baited Double Net Trap (HDNT), animal-baited traps (ABT) using cattle, and CDC light traps. Captured mosquitoes were identified morphologically, and salivary glands of Anopheles mosquitoes were examined for sporozoites using microscopy. Plasmodium infection was determined by Polymerase Chain Reaction (PCR), and identification of blood meal type was determined by PCR and diffuse serum agglutination assay.
Results: A total of 1815 Anopheles mosquitoes belonging to 19 species were collected by ABT (n = 1169), HDNT (n = 471) and CDC light trap (n = 175). Anopheles abundance and diversity varied by district and environment. Capture by HDNT of Anopheles of vectorial concern was observed between early evening and early morning. Plasmodium vivax infection was determined by PCR in two Anopheles dirus specimens captured by HDNT in forest sites. Blood from a range of hosts could, including human blood, could be detected in species considered primary and secondary vectors An. dirus, and Anopheles aconitus, and Anopheles maculatus, respectively.
Conclusions: A low number of Anopheles spp. considered primary vectors of concern and very low numbers of Plasmodium spp. infected Anopheles mosquitoes were captured at the end of the rainy season in the Central Highlands of Vietnam. However, capture species of vectorial concern by HDNT throughout the early to late evening demonstrates that use of additional personal protective measures could supplement current preventative measures, such as bed nets to prevent exposure to vectors of concern in this region.
(© 2023. The Author(s).)
Databáze: MEDLINE
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