AJTMH Transactions of the Royal Society of Tropical Medicine and Hygiene
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Am. J. Trop. Med. Hyg., 81(4), 2009, pp. 645-650
doi:10.4269/ajtmh.2009.08-0175;
Copyright © 2009 by The American Society of Tropical Medicine and Hygiene

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Effect of Peridomestic Environments on Repeated Infestation by Preadult Aedes aegypti in Urban Premises in Nha Trang City, Vietnam

Ataru Tsuzuki*, Vu Trong Duoc, Yukiko Higa, Nguyen Thi Yen, AND Masahiro Takagi
Department of Vector Ecology and Environment, Institute of Tropical Medicine, Nagasaki University, Nagasaki, Japan; National Institute of Hygiene and Epidemiology, Hanoi, Vietnam; Center for International Collaborative Research, Nagasaki University, Nagasaki, Japan

To determine the effect of peridomestic environments on Aedes aegypti infestation in urban premises, we conducted two consecutive surveys in the hot-dry and cool-wet seasons. Most Ae. aegypti pupae (79%) were recovered from premises where preadult forms (larvae and/or pupae) had been detected in both surveys. Hence, repeated infestation appears to be a useful parameter to identify premises associated with a high potential risk of dengue transmission. Multivariate analysis revealed that not only the persistent presence of containers discarded outdoors, wells, large plastic buckets, jars, and concrete toilet basins in the premises (adjusted odds ratios [aORs] = 63.3, 23.3, 22.5, 6.6, and 5.6, respectively) but also the presence of six or more residents was significantly associated with repeated infestation (aOR = 6.1). Premises with six or more residents along with specific container types from which a large number of pupae were recovered should be targeted in dengue-control programs.

Received April 8, 2008. Accepted for publication June 28, 2009.

Acknowledgments: We express our deep gratitude to Le Viet Lo, Le Trung Nghia, Ton Nu Van Anh, Bui Cam Nhung, and Bui Thanh Phu, in Nha Trang Pasteur Institute for field assistance. We also thank Toshihiko Sunahara for valuable suggestions.

Financial support: This work was supported by the Core University Program sponsored by the Japan Society for the Promotion of Science.

* Address correspondence to Ataru Tsuzuki, Department of Vector Ecology and Environment, Institute of Tropical Medicine, Nagasaki University, Nagasaki 852-8523, Japan. E-mail: atarutsuzuki{at}hotmail.com

Authors’ addresses: Ataru Tsuzuki and Masahiro Takagi, Department of Vector Ecology and Environment, Institute of Tropical Medicine, Nagasaki University, Nagasaki 852-8523, Japan, Tel: +81-95-849-7809, Fax: +81-95-849-7812, E-mails: atarutsuzuki{at}hotmail.com and mstakagi{at}nagasaki-u.ac.jp. Vu Trong Duoc and Nguyen Thi Yen, National Institute of Hygiene and Epidemiology, Hanoi, Vietnam, E-mails: vu.duoc{at}gmail.com and yenanihe{at}yahoo.com. Yukiko Higa, Center for International Collaborative Research, Nagasaki University, Nagasaki, Japan, E-mail: yukko{at}nagasaki-u.ac.jp.






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