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Am. J. Trop. Med. Hyg., 24(6), 1975, pp. 992-998
Copyright © 1975 by The American Society of Tropical Medicine and Hygiene

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Studies on the Epidemiology of California Encephalitis in an Endemic Area in Ohio in 1971*

Richard L. Berry, Margaret A. Parsons, Barbara J. LaLonde, Howard W. Stegmiller, Judy Lebio, Mazhar Jalil AND Ralph A. Masterson
Communicable Disease Division and Laboratory Division, Ohio Department of Health, 1571 Perry Street, P. O. Box 2568, Columbus, Ohio 43216

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 Aedes triseriatus 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 Aedes triseriatus in biting collections, the number of virus isolations, and positive transmission findings suggest that A. triseriatus 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.

Received June 24, 1975.
* This research was supported in part by Public Health Service Grant CC 00342 from the Center for Disease Control, Atlanta, Georgia.






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Copyright © 1975 by the American Society of Tropical Medicine and Hygiene.