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Research article - Peer-reviewed, 2021

The Distribution and Composition of Vector Abundance in Hanoi City, Vietnam: Association with Livestock Keeping and Flavivirus Detection

Nguyen-Tien, Thang; Bui, Anh Ngoc; Ling, Jiaxin; Tran-Hai, Son; Pham-Thanh, Long; Bui, Vuong Nghia; Dao, Tung Duy; Hoang, Thuy Thi; Vu, Lieu Thi; Tran, Phong Vu; Vu, Duoc Trong; Lundkvist, Ake; Nguyen-Viet, Hung; Magnusson, Ulf; Lindahl, Johanna Frida

Abstract

Background: Dengue virus and Japanese encephalitis virus are two common flaviviruses that are spread widely by Aedes and Culex mosquitoes. Livestock keeping is vital for cities; however, it can pose the risk of increasing the mosquito population. Our study explored how livestock keeping in and around a large city is associated with the presence of mosquitoes and the risk of them spreading flaviviruses. Methods: An entomological study was conducted in 6 districts with 233 households with livestock, and 280 households without livestock, in Hanoi city. BG-Sentinel traps and CDC light traps were used to collect mosquitoes close to animal farms and human habitats. Adult mosquitoes were counted, identified to species level, and grouped into 385 pools, which were screened for flaviviruses using a pan-flavivirus qPCR protocol and sequencing. Results: A total of 12,861 adult mosquitoes were collected at the 513 households, with 5 different genera collected, of which the Culex genus was the most abundant. Our study found that there was a positive association between livestock keeping and the size of the mosquito population-most predominantly between pig rearing and Culex species (p < 0.001). One pool of Cx. tritaeniorhynchus, collected in a peri-urban district, was found to be positive for Japanese encephalitis virus. Conclusions: The risk of flavivirus transmission in urban areas of Hanoi city due to the spread of Culex and Aedes mosquitoes could be facilitated by livestock keeping.

Keywords

vector abundance; urban livestock keeping; mosquito-borne flavivirus; Japanese Encephalitis virus; Hanoi city

Published in

Viruses
2021, volume: 13, number: 11, article number: 2291
Publisher: MDPI

Authors' information

Nguyen-Tien, Thang
Uppsala University
Nguyen-Tien, Thang
International Livestock Research Institute (ILRI)
Bui, Anh Ngoc
Natl Inst Vet Res
Ling, Jiaxin
Uppsala University
Tran-Hai, Son
Natl Inst Hyg and Epidemiol
Pham-Thanh, Long
International Livestock Research Institute (ILRI)
Pham-Thanh, Long
Minist Agr and Rural Dev
Pham-Thanh, Long
Uppsala University
Bui, Vuong Nghia
Natl Inst Vet Res
Dao, Tung Duy
Natl Inst Vet Res
Hoang, Thuy Thi
Natl Inst Vet Res
Vu, Lieu Thi
Natl Inst Hyg and Epidemiol
Tran, Phong Vu
Natl Inst Hyg and Epidemiol
Vu, Duoc Trong
Natl Inst Hyg and Epidemiol
Lundkvist, Ake
Uppsala University
Nguyen-Viet, Hung
International Livestock Research Institute (ILRI)
Swedish University of Agricultural Sciences, Department of Clinical Sciences
Lindahl, Johanna Frida (Lindahl, Johanna Frida)
International Livestock Research Institute (ILRI)
Lindahl, Johanna Frida (Lindahl, Johanna Frida)
Uppsala University
Swedish University of Agricultural Sciences, Department of Clinical Sciences

UKÄ Subject classification

Clinical Science
Pathobiology

Publication Identifiers

DOI: https://doi.org/10.3390/v13112291

URI (permanent link to this page)

https://res.slu.se/id/publ/114868