Role of Aedes aegypti and Aedes albopictus during the 2011 dengue fever epidemics in Hanoi, Vietnam.
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.
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.
Pham Thi
PT
Kim Lien
National Institute of Hygiene and Epidemiology, 1 Yersin Street, 10000 Hanoi, Viet Nam.
Vu Trong
VT
Duoc
ISEM, UMR 5554, CNRS-UM2-IRD, Université Montpellier 2 CC065, Place E. Bataillon, 34095 Montpellier Cedex 5, France.
Laurent
L
Gavotte
CPBS, UMR 5236, CNRS-UM1-UM2, 1919, route de Mende 34293 Montpellier Cedex 5, France.
Emmanuel
E
Cornillot
National Institute of Hygiene and Epidemiology, 1 Yersin Street, 10000 Hanoi, Viet Nam.
Phan Thi
PT
Nga
CPBS, UMR 5236, CNRS-UM1-UM2, 1919, route de Mende 34293 Montpellier Cedex 5, France.
Laurence
L
Briant
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: roger.frutos@univ-montp2.fr.
Roger
R
Frutos
National Institute of Hygiene and Epidemiology, 1 Yersin Street, 10000 Hanoi, Viet Nam.
Tran Nhu
TN
Duong
Aedes aegypti; Aedes albopictus; Dengue; Vector density