Cutaneous eruptions in Indian tick typhus.

Although frequently unrecognized, rickettsial infections may be an important cause for fever and exanthem in persons presenting to physicians in South India. Most often these patients are referred to dermatology departments with a diagnosis of "drug eruption." In the current study the authors analyzed 12 cases of rickettsial fever that were seen in the dermatology department of St. John's Medical College Hospital, Bangalore, between 1985 and 1989. The distinctive cutaneous eruption was found to be an important clue to an early clinical diagnosis. Specific serodiagnosis enabled us to confirm that Indian tick typhus, a member of the spotted fever group, was the most frequent cause for rickettsial fever presenting at our hospital.