The Thai Journal of Veterinary Medicine


1) Ac. aegypti was the most susceptible to D. immitis among 5 species of mosquitoes used in this study. Complete development of D. immitis was not achieved in one species tested - Armi geres subalbatus. 2) Older Ae. aegypti were more susceptible to D. immitis than the youn-ger mosquitoes, while older An. stephensi were less susceptible than yonnger mosquitoes. 3) The most optimum temperature of larvae in mosquitoes was 27°C, but at 31°C mosquitoes developed longer larvae in a shorter period of time than they did at two low temperatures. Beyond that, larvae developed very well in An. stephensi at the lowest temperature (23°C) while in Ae. aegypti larvae failed to reach as great a stage of development as in An. stephensi. 4) The percentage of mosquitoes surviving following infection decreased as the intensity of microfilaremia in the ingested blood increased. An. stephensi was less able than Ae. aegypti to tolerate the ingestion of high number of micro- filaria.

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