Address correspondence to Hitoshi Kawada, Department of Vector Ecology and Environment, Institute of Tropical Medicine, Nagasaki University, Nagasaki 852-8523, Japan. E-mail:
Authors’ addresses: Hitoshi Kawada and Masahiro Takagi, Department of Vector Ecology and Environment, Institute of Tropical Medicine, Nagasaki University, Nagasaki 852-8523, Japan. Tomonori Iwasaki, Yoshinori Shono, and Yasuyuki Katayama, Agricultural Chemicals Research Laboratory, Sumitomo Chemical Co., Ltd., Hyogo 665-8555, Japan. Luu Le Loan and Tran Khanh Tien, Pasteur Institute, Ho Chi Minh City, Vietnam. Nguyen Thi Nhu Mai, Tien Giang Preventive Medicine Center, My Tho City, Vietnam.
Acknowledgments: We express our deep gratitude to K. Watanabe (Sumika LifeTech Co., Ltd., Osaka, Japan) for providing the plastic samples. We also thank H. T. T. Tran (Pasteur Institute, Ho Chi Minh City, Vietnam) for assistance with the study.
Financial support: This study was supported by the Core University Program sponsored by the Japan Society for the Promotion of Science.
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