Role of Aedes aegypti and Aedes albopictus during the 2011 dengue fever epidemics in Hanoi, Vietnam

Pham Thi Kim Lien; Vu Trong Duoc; Laurent Gavotte; Emmanuel Cornillot; Phan Thi Nga; Laurence Briant; Roger Frutos; Tran Nhu Duong

doi:10.1016/j.apjtm.2015.06.009

Role of Aedes aegypti and Aedes albopictus during the 2011 dengue fever epidemics in Hanoi, Vietnam

Asian Pac J Trop Med. 2015 Jul;8(7):543-8. doi: 10.1016/j.apjtm.2015.06.009. Epub 2015 Jul 9.

Authors

Pham Thi Kim Lien¹, Vu Trong Duoc², Laurent Gavotte³, Emmanuel Cornillot⁴, Phan Thi Nga², Laurence Briant⁴, Roger Frutos⁵, Tran Nhu Duong²

Affiliations

¹ National Institute of Hygiene and Epidemiology, 1 Yersin Street, 10000 Hanoi, Viet Nam; CPBS, UMR 5236, CNRS-UM1-UM2, 1919, route de Mende 34293 Montpellier Cedex 5, France.
² National Institute of Hygiene and Epidemiology, 1 Yersin Street, 10000 Hanoi, Viet Nam.
³ ISEM, UMR 5554, CNRS-UM2-IRD, Université Montpellier 2 CC065, Place E. Bataillon, 34095 Montpellier Cedex 5, France.
⁴ CPBS, UMR 5236, CNRS-UM1-UM2, 1919, route de Mende 34293 Montpellier Cedex 5, France.
⁵ CPBS, UMR 5236, CNRS-UM1-UM2, 1919, route de Mende 34293 Montpellier Cedex 5, France; Intertryp, UMR 17, Cirad-IRD, Campus International de Baillarguet, 34398 Montpellier Cedex 5, France. Electronic address: [email protected].

PMID: 26276285
DOI: 10.1016/j.apjtm.2015.06.009

Abstract

Objective: To record the human cases of dengue fever (DF) and investigate the Aedes mosquito species circulating during the Hanoi 2011 DF epidemics.

Methods: 24 different outbreak points were recorded in 8 districts between August and December 2011.

Results: 140 patients were hospitalized following dengue diagnostic with a predominance of males (59.3%) and the 15-34 age class. Only DENV-1 (11.27%) and DENV-2 (88.73%) serotypes were detected in human samples. Mosquito sampling performed in and around patients households revealed the predominance of Aedes aegypti (A. aegypti) (95.15%) versus Aedes albopictus (4.85%).

Conclusions: There is a positive correlation between the population density of A. aegypti and the number of human cases and duration of outbreaks. This was not observed for Aedes albopictus. Three pools of A. aegypti were positive with dengue virus, two with DENV-1 and one with DENV-2.

Keywords: Aedes aegypti; Aedes albopictus; Dengue; Vector density.