1956 年 68 巻 10 号 p. 1821-1837
“Umayado Disease” has happened in summer especially at east area of Kagawa-ken.
I have studied about. what kind of Tsutsugamushi will have increased and made peak at summer.
Against this purpose, I have caught rats and collected the Tsutsugamushi living upon the rats twice a month regularly extending full 2 years up, and I have determined that a lot of Trombicula tosa has appeared and made the peak at summer usually.
I think Trombicula tosa should be valuable agency to contaminate the Rickettsia orientalis at Kagawa-ken.