THE FILARIAL PARASITE, MACACANEMA FORMOSANA FROM THE TAIWAN MONKEY AND ITS DEVELOPMENT IN VARIOUS ARTHROPODS
NAVAL MEDICAL RESEARCH UNIT NO 2 MANILA (PHILIPPINES) MANILA
Pagination or Media Count:
Taiwan monkeys Macaca cyclopis were trapped and examined to determine the geographical distribution and foci of the filaria Macacanema formosana. The filariapositive area was surveyed to determine the potential arthropod vectors. Suspected intermediate hosts were experimentally fed on filaria-infected monkeys and the development of the filarial larvae has been recorded for the first time. Studies were made to determine microfilariae density and periodicity. Ecologic factors are discussed. Some 22 species of arthropods experimentally exposed to infective blood meals from monkeys with infections of Macacanema formosana fall into five distinct groups based on the fate of the microfilariae from the peripheral blood 1 The ceratopogonids, Culicoides anamiensis, C. variipennis, and to some extent, C. guttipennis, ingested a blood meal containing active, motile microfilariae. The blood meal was digested and the microfilariae made their way to the thoracic muscles to develop. The 3rd stage larvae were observed emerging from the proboscis of C. amamiensis after 16 days. The remaining groups were not as successful. 2 The argasid tick, Ornithodoros tartakovskyi, and the reduviid, Rhodnius prolixus, retained the blood meal for at least 24 days, but the microfilariae did not develop. 3 Stomoxys, Chrysops, and 5 genera 14 species of culicids took a blood meal containing active, motile microfilariae that passed with the blood dejecta from the mosquito or fly in 48 to 120 hours with no development of the microfilariae. 4 Pedicinus eurygaster lice collected on filarial positive monkeys contained plasma or body fluids but no microfilariae were noted.