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Although there are few cockroaches in newly built or insecticide-treated buildings or houses, they enter from outside, increase in number and spread out widely as time goes by. To elucidate how German cockroaches distribute widely in such places, we previously investigated their horizontal movement ...

Mosquitoes in several species are well known to be serious vectors of epidemic diseases in the world. As a part of the basic survey to watch possible invasion of West Nile virus into Yokohama, one of the city with a big international port in Japan, mosquitoes were collected to elucidate their geogra...