Institute of Tropical Medicine, Nagasaki University
Abstract
Weekly records of mosquito attacks in the usual life of voluntary monitors were analyzed to evaluate the realistic frequency of mosquito attacks. Culex pipiens pallens, Cx. tritaeniorhynchus, and Aedes albopictus were equally incriminatory species. The male monitors who engaged in outdoor activities such as cleaning, repairing and gardening experienced more attacks than the others whose main outdoor activities were shopping, strolling and visiting other places. More attacks were reported from June to August than in other months, and the number of attacks per man-day was consistently around 0.3 during this period, although the predominant species shifted from Cx. pipiens pallens to Cx. tritaeniothynchus and Ae. albopictus. The attacks were most frequent at dusk. Seasonal change in the density examined by UV-light trap did not always reflect the seasonal tendency of attacks
