Distribution and Incidence

The geographic boundaries of this malady are defined by the range of its vectors, primarily the trombiculid mites, Lentotrombidium akamushi and Leototrombidium deliensis, and their vertebrate hosts. They extend from India and Pakistan in the West, to Japan and the northern portions of Australia, including all the countries of Southeast Asia, southern China, Korea, the Philippines, and Indonesia, as well as additional islands in the Pacific Ocean (see Map VIII. 153.1). During World War II, the incidence of scrub typhus rose dramatically among military troops, reaching 900 per 1,000 personnel in some areas. It continues to remain a problem in isolated, rural areas.

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