© 1988 Oxford University Press
research-article |
A Seroepidemiological Survey of HTLV-1 in the Philippines


*Department of Anthropology, Faculty of Science, The Univenity of Tokyo Tokyo, 113, Japan
Department of Cytogenetics, Medical Research Institute, Tokyo Medical and Dental Univenity Tokyo, 113, Japan
Reprint requests: Department of Biochemistry, Primate Research Institute, Kyoto UniversityAichi, 484, Japan
The prevalence of human T-lymphotropic retrovirus type-1 (HTLV-1) was examined in the Asian Pacific area to search for endemic foci outside Japan. A total of 1323 sera from healthy subjects in the Philippines including Fillpino lowlanders, Mongoloid slash-and-burn agriculturalists and the Mongoloid aboriginal hunter-gatherers (Aeta group and Mamanwa group) were examined for the presence of antibodies to HTLV-1 by the indirect immunofluorescence test and by the Western blot technique using HTLV-1 carrying cells. Nineteen out of 20 HTLV-1 antibody carriers found in the present study are clustered in the Aeta group of Mongoloid aboriginal hunter-gatherers who have until recently been isolated In the remote mountainous areas of Luzon Island since their arrival in the Philippines during the last glacial era (1200015000 years ago). This finding supports the theory that HTLV-1 orglnated In Mongoloid racial groups during prehistoric times.
Revised 1 October 1997