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FIELD EVALUATION OF SPATIAL REPELLENCY OF METOFLUTHRIN IMPREGNATED PLASTIC STRIPS AGAINST MOSQUITOES IN HAI PHONG CITY, VIETNAM

Spatial repellency of metofluthrin-impregnated polyethylene plastic strips against mosquitoes, Aedes aegypti and Culex quinquefasciatus, were studied in a residential area in Hai Phong city, Vietnam. Thirty houses were selected as trial sites; half of these were assigned as untreated control and the other half were assigned for treatment. Primarily, irrespective of the room size, one room was treated with one strip. The dominant species in the trial sites were Culex quinquefasciatus and Aedes aegypti. A rapid decrease in the mosquito index was observed immediately after the treatment with metofluthrin strips, and treatment was effective for at least 6 weeks.

Received January 20, 2005. Accepted for publication April 9, 2005.

Acknowledgments: We express our deep gratitude to T. Igarashi, Sumika LifeTech Co., Ltd., Osaka, Japan, for providing the plastic samples. We also thank H. T. Long, the Director of the National Institute of Hygiene and Epidemiology, Hanoi, Vietnam, for supervising this study.

Financial support: This study is supported and sponsored by the Japan Society for the Promotion of Science (JSPS).

^* Address correspondence to Hitoshi Kawada, Department of Vector Ecology and Environment, Institute of Tropical Medicine, Nagasaki University, Sakamoto 1-12-4, Nagasaki 852-8523, Japan. E-mail: vergiss{at}net.nagasaki-u.ac.jp

Authors’ addresses: Hitoshi Kawada and Masahiro Takagi, Department of Vector Ecology and Environment, Institute of Tropical Medicine, Nagasaki University, Nagasaki 852-8523, Japan. Nguyen Thi Yen and Nguyen Thuy Hoa, National Institute of Hygiene and Epidemiology, Hanoi, Vietnam. Truong Minh Sang, Hai Phong Preventive Medicine Center, Hai Phong, Vietnam. Nguyen Van Dan, Do Son Health Center, Hai Phong, Vietnam.

Reprint requests: Hitoshi Kawada, Department of Vector Ecology and Environment, Institute of Tropical Medicine, Nagasaki University, Sakamoto 1-12-4, Nagasaki, 852-8523, Japan, E-mail: vergiss{at}net.nagaski-u.ac.jp.

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