Volume 3, Issue 4
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



In a study to determine the natural vectors of avian infection in Kern County, California 3,364 mosquitoes were examined for parasites during the summers of 1946, 1947, 1949 and 1950. The following average infection rates were demonstrated: , 199 of 2,074 (9.6 per cent); , 28 of 180 (15.6 per cent); and , 14 of 746 (1.9 per cent). These differences are believed to reflect variation in vector efficiency. Of 364 and examined, only 2 were infected with what appeared to be young oocysts of unidentified parasites.

The intensity of infection in the principal vector, , varied considerably in different years and in different areas. These variations are believed to be due to changeable factors such as climate, the effect of mosquito control on the vector population, and ecological differences between areas.

was isolated from naturally infected and .


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