Volume 24, Issue 6
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



An epidemiologic study of California encephalitis (CE) was made in the village of Gambier, Knox County, Ohio, during 1971. Five California encephalitis virus (CEV) isolates of the La Crosse strain were obtained from 403 adult female mosquitoes, 1 in July, 1 in August, and 3 in September, giving field infection ratios of 1:29, 1:121, and 1:79, respectively. The abundance of in biting collections, the number of virus isolations, and positive transmission findings suggest that is the vector of La Crosse virus to humans in this area. Six of the 306 vertebrate sera tested (3 eastern chipmunks and 3 woodchucks) were found to have hemagglutination inhibiting and/or neutralizing antibodies to CEV. Two human cases of CE were found. The average age at onset was 8.4 years, slightly older than the State average of 7 years, and the peak months of onset were August and September, the same as the average for the State.


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  • Received : 24 Jun 1975
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