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Two communities of Orang Asli (aborigines) in Peninsular Malaysia were observed for evidence of Rickettsia tsutsugamushi infection over periods of 18 mo. Sequential sera were examined for antibody by the indirect immunofluorescence test. The incidence of infection in the two self-selected populations in the two communities was calculated to be 3.9% per month and 3.2% per month.
Accepted for publication June 25, 1977.
Address reprint requests to: Commander, U.S. Army Medical Research Unit, Institute for Medical Research, Jalan Pahang, Kuala Lumpur 02-14, Malaysia.
* This work was supported by Research Grant No. DAMD17-76-G-9413 from the U.S. Army Medical Research and Development Command, Washington, D.C.
Major, R.A.M.C. Present address: Royal Army Medical College, Millbank, London, SW1, England.
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