We report a case of leptospirosis in Tokyo in winter due to a rat bite, an uncommon cause of Leptospira infection. In Japan, many cases due to exposure to fresh water have been reported from domestic southwest islands in summer. However, a previous report on leptospirosis in Tokyo documented several cases occurring in winter. The main route of infection in the Tokyo metropolitan area during winter was attributed to the increased chance of direct rat exposure. Rapid and feasible diagnostic methods are needed to elucidate its epidemiology and provide prompt treatment.
Address correspondence to Tetsuya Suzuki, National Center for Global Health and Medicine, 1-21-1, Toyama, Shinjuku-ku, Tokyo, 162-8655, Japan. E-mail: firstname.lastname@example.org
Financial support: K. Y. received research grants from Fujirebio, Inc., Mizuho Medy, Co., Ltd., and VisGene Inc., Sanyo Chemical Industries, Ltd., outside the submitted work.