Abstract
Epidemiological survery was made on Sueyoshi area in Hachijo Island. A total of 134 patients have already been reported in this area since 1950. On investigating the geographical distribution of the patients, the occurrence of this infection was found to be closely related with the sun shine hours. In Sueyoshi area, both the appearance and disappearance of the epidemic of Shichito fever were quicker than the other parts of the Island. In addition, the presence of recurrence and fatal cases was confirmed though both of them had been believed to be absent in the past.
