Scrub typhus is endemic to a part of the world known as the "tsutsugamushi triangle", which extends from northern Japan and far-eastern Russia in the north, to northern Australia in the south, and to Pakistan and Afghanistan in the west. Scrub typhus is endemic to a part of the world known as the "tsutsugamushi triangle", which extends from northern Japan and far-eastern Russia in the north, to northern Australia in the south, and to Pakistan and Afghanistan in the west. [ 3 ]恙蟲病流行到世界的一部分，稱為“恙蟲病三角”，從日本北部的延伸和遠東俄羅斯北部，澳大利亞北部，南部，以及巴基斯坦和阿富汗西部。 [3 ]