Water level flux in household containers in Vietnam - a key determinant of Aedes aegypti population dynamics

Jeffery, Jason A. L., Clements, Archie C. A., Nguyen, Yen Thi, Nguyen, Le Hoang, Tran, Son Hai, Le, Nghia Trung, Vu, Nam Sinh, Ryan, Peter A. and Kay, Brian H. (2012) Water level flux in household containers in Vietnam - a key determinant of Aedes aegypti population dynamics. PLoS One, 7 7 Article No.e39067: . doi:10.1371/journal.pone.0039067

Author Jeffery, Jason A. L.
Clements, Archie C. A.
Nguyen, Yen Thi
Nguyen, Le Hoang
Tran, Son Hai
Le, Nghia Trung
Vu, Nam Sinh
Ryan, Peter A.
Kay, Brian H.
Title Water level flux in household containers in Vietnam - a key determinant of Aedes aegypti population dynamics
Journal name PLoS One   Check publisher's open access policy
ISSN 1932-6203
Publication date 2012-07
Sub-type Article (original research)
DOI 10.1371/journal.pone.0039067
Open Access Status DOI
Volume 7
Issue 7 Article No.e39067
Total pages 6
Place of publication San Francisco, CA United States
Publisher Public Library of Science
Collection year 2013
Language eng
Formatted abstract
We examined changes in the abundance of immature Aedes aegypti at the household and water storage container level during the dry-season (June-July, 2008) in Tri Nguyen village, central Vietnam. We conducted quantitative immature mosquito surveys of 171 containers in the same 41 households, with replacement of samples, every two days during a 29-day period. We developed multi-level mixed effects regression models to investigate container and household variability in pupal abundance. The percentage of houses that were positive for I/II instars, III/IV instars and pupae during any one survey ranged from 19.5-43.9%, 48.8-75.6% and 17.1-53.7%, respectively. The mean numbers of Ae. aegypti pupae per house ranged between 1.9-12.6 over the study period. Estimates of absolute pupal abundance were highly variable over the 29-day period despite relatively stable weather conditions. Most variability in pupal abundance occurred at the container rather than the household level. A key determinant of Ae. aegypti production was the frequent filling of the containers with water, which caused asynchronous hatching of Ae. aegypti eggs and development of cohorts of immatures. We calculated the probability of the water volume of a large container (>500L) increasing or decreasing by ≥20% to be 0.05 and 0.07 per day, respectively, and for small containers (<500L) to be 0.11 and 0.13 per day, respectively. These human water-management behaviors are important determinants of Ae. aegypti production during the dry season. This has implications for choosing a suitable Wolbachia strain for release as it appears that prolonged egg desiccation does not occur in this village.
Keyword Dengue Vector
Wolbachia Infection
Model Development
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2013 Collection
School of Public Health Publications
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