Scrub typhus; Chigger­ borne rickettsiosis

Rickettsial Diseases

Animals Involved

Rodents, insectivores

Known Distributions

Asia, Australia, islands of southwestern Pacific Ocean; cases are usually concentrated regionally in “typhus islands”

Probable Means of Spreading

Bite of infected larval trombiculid mites (chiggers)

Clinical Manifestations in People

Eschar in some; rash, headache, fever, painful lymphadenopathy, body aches, interstitial pneumonitis, GI signs; pneumonia,
neurologic signs or cardiac complications in some; mild to severe; convalescence prolonged; case fatality rate up to 30%–50% if untreated

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Rickettsial Diseases