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:
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.
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).
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