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Malaria Endemicity among Orang Asli (Malaysian Aborigines) as Determined by Indirect Fluorescent Antibody Tests

Fluorescent antibodies were detected in 89% of 288 Orang Asli (Malaysian aborigines) with Plasmodium falciparum antigen and in 62% with P. brasilianum (for P. malariae) antigen. Blood films from 18 donors were positive for P. falciparum; 2 of them had mixed infection with P. vivax. Seven of the P. falciparum-positive blood films were from children in the 2- to 9-year age group. Of 17 sera from cord blood, 16 had significant levels of P. falciparum antibody and 14 of P. malariae antibody, the levels being the same as those of the mothers. None of these babies had congenital malaria. A higher percentage of male donors reacted to both antigens. There was an age dependent increase in the number positive and the maximum titers.

Accepted for publication December 18, 1976.