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

Gary G. ClarkDivision of Laboratories, Division of Disease Control, 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, (2121 West Taylor Street, Chicago, Illinois 60612)

Search for other papers by Gary G. Clark in
Current site
Google Scholar
PubMed
Close
,
Harvey L. PretulaDivision of Laboratories, Division of Disease Control, 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, (2121 West Taylor Street, Chicago, Illinois 60612)

Search for other papers by Harvey L. Pretula in
Current site
Google Scholar
PubMed
Close
,
Carl W. LangkopDivision of Laboratories, Division of Disease Control, 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, (2121 West Taylor Street, Chicago, Illinois 60612)

Search for other papers by Carl W. Langkop in
Current site
Google Scholar
PubMed
Close
,
Russell J. MartinDivision of Laboratories, Division of Disease Control, 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, (2121 West Taylor Street, Chicago, Illinois 60612)

Search for other papers by Russell J. Martin in
Current site
Google Scholar
PubMed
Close
, and
Charles H. CalisherDivision of Laboratories, Division of Disease Control, 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, (2121 West Taylor Street, Chicago, Illinois 60612)

Search for other papers by Charles H. Calisher in
Current site
Google Scholar
PubMed
Close
Restricted access

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.

Author Notes

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

Deceased 30 November 1981.

Save