Author : Jariya Winyasopit

Summary : In Thailand, only Anopheles vagus vagus Donitz was observed to be infected with C. indicus. The percentage of infection varied from zero to 42.7. High percentage of infection was found in the provinces near the country's border namely, Rayong, Surin and Chiangrai and in rice fields which were newly transplanted and with stagnant water. Five species of copepod were found in the same habitat namely : Mesocyclops leukarti pilosa Keifer, Microcyclops varicans Sar., Neodiaptomus botulifer Keifer, N. Mephistopheles Brehm and Thermocyclops crassus (Fischer). In Luzon, Philippines, four species of anopheline infected with C. indicus were found namely : Anopheles vagus vagus Donitz, An. lesteri Baisas and Hu, An. indefinitus (Ludlow) and An. philippinensis Ludlow. The percentage of infection varied from zero to 78.9. High percentage of infection was found in locations near houses or large animals and also in newly transplanted and stagnant rice field. Three species of copepod were found namely : mesocyclops leukarti Keifer, Cryptocyclops bicolor linjanticus Keifer and Microcyclops varicans Sar. Some M. varicans from field collections were infected with C. indicus. Coelomomyces infected mosquito larvae were collected from water either clear or turbid and partially shaded or full sunlight area. Water pH and water temperature were in similar levels from all collected sites. Field observations indicated that the appearance of infection corresponded with anopheline development in the area where alternate host was present.