Sunday, 24 Feb 2019
Page: 101
Volume XXV, Issue 2(162) 2015
Comparison of Aedes aegypti and Aedes albopictus mosquito dispersal in urban areas
Author: Vu Trong Duoc, Nguyen Duc Thinh, Tham Chi Dung and Tran Nhu Duong
In Vietnam, the number of dengue hemorrhagic fever (DHF) cases has increased since 1958. The pathogen (dengue virus) can be found in the whole country and transmitted by both Ae. aegypti and Ae. albopictus. Considering that the mark-release-recapture procedure of Ae. aegypti and Ae. albopictus in Vietnam is yet to be examined, knowledge of the flight range and dispersal of mosquitoes is essential to understand vector-borne disease transmission dynamics among human populations. In an applied sense, dispersal is an important factor for determining the necessary appropriate control limits to interrupt pathogen transmission. Ae. aegypti and Ae. albopictus were dispersed in an urban area in Hanoi City, Vietnam, where dengue outbreaks occur yearly. A total of 9,000 female Aedes mosquitoes, including 4,780 Ae. aegypti and 4,220 Ae. albopictus that were marked as F1 generation with fluorescent dye, were used in this study. A total of 3,000 mosquitoes were used for each release-capture experiment. The mosquitoes were then recaptured by sticky traps and CDC backpack aspirator machines during 7 days after the release. The recapture rates of Ae. aegypti and Ae. albopictus were 3.01% and 2.44%, respectively (χ2 = 2.8, p > 0.05). The mean distances travelled by Ae. aegypti and Ae. albopictus were 10–63.3 and 25.5–87.1 m, respectively. An average distance from the release site to each premise was estimated to be 35.3 m for Ae. aegypti and 50.6 m for Ae. albopictus. The maximum flight range of Ae. aegypti was 100 m, whereas that of Ae. albopictus was 180 m during 7 days post-release. No Ae. aegypti from release point was found in the far side of gardens, but many Ae. albopictus reached the site. The rate of decrease of recaptured Ae. aegypti and Ae. albopictus mosquitoes is significantly associated with the function of post-release days (p ≤ 0.001) and zones (p = 0.01 for Ae. aegypti, p = 0.003 for Ae. albopictus), respectively. In conclusion, Ae. aegypti and Ae. albopictus females could disperse to 100 and 180 m radii, respectively, during 7 days post-release. Therefore, the virus could spread extremely fast in the field.
Aedes aegypti, Aedes albopictus, dispersal, recapture
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Happy New Year 2019! Year of the Pig
The Vietnam Journal of Preventive Medicine wish all readers with healthy, happiness and prosperity in the year of the Pig. Happy New Year 2019
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