Unexpected dengue outbreak by the Asian tiger mosquito, Aedes albopictus, in Tokyo in 2014
After travelling to Japan from Germany on a direct flight, a German traveler developed dengue fever in late August 2013. Autochthonous dengue virus infection has not yet been reported in Japan. An evaluation of the population density of the vector mosquito, Aedes albopictus, was performed in areas visited by the German patient. All areas visited by the German patient had an annual mean temperature higher than 12°C, which is recognized as a sufficient temperature for the establishment of Ae. albopictus in Japan and worldwide. The population density of Ae. albopictus was found to be very high in urban areas of Japan. In late August 2014, the Ministry of Health, Labour and Welfare of Japan received reports on three autochthonous dengue cases. Nineteen cases of febrile diseases in a hospital in Tokyo were simultaneously confirmed as dengue fever and dengue virus 1 infection. Epidemiological surveillance showed that all three patients visited Yoyogi Park in Tokyo prior to developing dengue. By mid-October 2014, 162 individuals had contracted dengue. Yoyogi park was used for many international festivals during the summer months.
Kobayashi, M. (2017). Unexpected dengue outbreak by the Asian tiger mosquito, Aedes albopictus, in Tokyo in 2014. Acta Hortic. 1169, 73-76
dengue outbreak, Tokyo, 2014, high population density, Aedes albopictus