Evidence of possible natural infections of man with Brugia pahangi in South Kalimantan (Borneo), Indonesia.

Blood from 9 humans, 6 domestic cats (Felis domesticus), and 5 silvered leaf monkeys (Presbytis cristatus) from South Kalimantan (Borneo), Indonesia, with known filarial infections was examined for determination ofacid phosphatase activity of the microfilarae (mff). The findings suggest 1) that Brugia parasites from domestic cats and silvered leaf monkeys can be speciated by acid phosphatase activity and that speciation by acid phosphatase assay corresponds to that based upon adult worm morphology and 2) that Brugia mff from humans have acid phosphatase activity characteristic of that of B. pahangi microfilariae from cat and monkey. Thus B. pahangi may infect man in South Kalimantan.