Results of mosquito surveillance using dry-ice traps from 2003 to 2013 at the National Institute of Infectious Diseases, Tokyo, Japan

摘要

Mosquitoes were collected weekly from May 2003 to December 2013 at a pair of sites within the premises of the National Institute of Infectious Diseases, Tokyo, Japan. The mosquito trap was equipped with1kg dry ice and battery-operated suction mechanism. A total of 10,546 adults belonging to 7 species in 3 genera were collected in this study. Aedes albopictus and Cx. pipiens gr. were the dominant mosquitoes, composing 99.7% of the total mosquitoes collected. Six and12 adults of Cx. tritaeniorhynchus were collected in early spring and in late summer to autumn, respectively. More Cx. pipiens gr. were collected at the high trap site near a tree canopy rather than the low trap site near the ground every year, whereas only1to15% of Ae. albopictus were collected at the high trap site, indicating a difference in searching behavior between the two species. The female density of Cx. pipiens gr. was high (>10/trap/day) during early June to early August, and a high Cx. pipiens gr.-related risk is expected in this period. Density of female Ae. albopictus was high (>10/trap/day) during the 28th to 41st week, suggesting a high risk of transmission of Ae. albopictus-bome pathogens from mid-July to mid-October in Tokyo.