AJTMH Transactions of the Royal Society of Tropical Medicine and Hygiene
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Am. J. Trop. Med. Hyg., 32(4), 1983, pp. 838-843
Copyright © 1983 by The American Society of Tropical Medicine and Hygiene

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Occurrence of La Crosse (California Serogroup) Encephalitis Viral Infections in Illinois*

Gary G. Clark{dagger}, Harvey L. Pretula{ddagger}, Carl W. Langkop, Russell J. Martin AND Charles H. Calisher
Division of Laboratories (2121 West Taylor Street, Chicago, Illinois 60612) and Division of Disease Control (535 West Jefferson Street, Springfield, Illinois 62761), Illinois Department of Public Health; and Vector-Borne Viral Diseases Division, Centers for Disease Control, U.S. Public Health Service, Department of Health and Human Services, P.O. Box 2087, Fort Collins, Colorado 80522

La Crosse (LAC) virus (California encephalitis serogroup) was identified as the etiologic agent of disease in 61 cases of California encephalitis (CE) that occurred in Illinois between 1976 and 1980. This group represented 54% of all 114 laboratory-diagnosed cases of CE between 1966 and 1980. Key epidemiologic observations included: 88% of the 61 cases had onset in July, August, or September; the 5- to 9-year-old age group represented 48% of the cases; the male: female sex ratio was 2:1; 97% of the cases occurred in the northern half of the state; and 61% of the cases occurred in Peoria County. Four instances of probable common source of exposure were reported. Average length of hospitalization was 8.3 days (range 3–31 days). Hospitalization costs were estimated at $3,967–$5,750 per case. An "average" year in Illinois yields 12 cases of LAC encephalitis with direct hospitalization costs of $47,604–$69,000.

Accepted for publication November 24, 1982.


* Address reprint requests to: Dr. Russell J. Martin, Division of Disease Control, Illinois Department of Public Health, 535 W. Jefferson Street, Springfield, Illinois 62761.


{dagger} Present address: Department of Arboviral Entomology, USAMRIID, Fort Detrick, Frederick, Maryland 21701.


{ddagger} Deceased 30 November 1981.






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Copyright © 1983 by the American Society of Tropical Medicine and Hygiene.