Main » Infectious diseases » Arthropod-borne Infection » Scrub Typhus
Scrub typhus occurs in the Indian subcontinent, SE Asia, the Far East and parts of the Southwest Pacific. R. tsutsugamushi is present in trombiculid-infested rodents in specialised ecological niches known as mite islands particularly in Southeast Asia and islands of the Western Pacific. Not far from Kuala Lumpur, for example, Leptotrombidium deliensis is found in the forest, and L. akamushi in the grass ('lalang').
Distribution map of scrub typhus.
Photo 1. Larva of Leptotrombidium. Larval mites transmit the infection from rodent to man when he comes into accidental association with mite infested terrain. The mites act as reservoirs since transovarial transmission of the Rickettsia occurs. (X 125)
Photo 2. Eshar of mite bite. A typical 'eschar' forms at the site of the trombiculid bite and precedes the fever.
Photo 3. Scrub typhus rash. The maculopapular eruption appears on about the sixth or seventh day of the illness, and lasts 3 or 4 days. While seen mainly on the trunk, upper arms and thighs, it may also appear on the face, hands (as shown here) and feet.
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