title: St Louis encephalitis. The 1975 epidemic in Mississippi.
abstract: In 1975, 229 laboratory-documented cases of St Louis encephalitis, 36 of which resulted in death, occurred in Mississippi. A total of 58% of these persons had encephalitis, 15% had aseptic meningitis, 21% had a febrile illness with no known CNS involvement, and 6% had other syndromes. Attack rates and case-fatality ratios increased with age. Although 60% of the cases occurred in a four-county area of northwest Mississippi, cases occurred in 42 of the 82 counties throughout the state. The epidemic erupted almost simultaneously, with variable intensity, in widely separated areas. Mosquito-control, measures were applied, but the results were not quantified.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000818:Animals; D000914:Antibodies, Viral / Q000134:cerebrospinal fluid; D002648:Child; D002675:Child, Preschool; D004196:Disease Outbreaks / Q000453:epidemiology*; D004199:Disease Vectors; D004674:Encephalitis, St. Louis / Q000453:epidemiology* / Q000276:immunology / Q000635:transmission; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D008875:Middle Aged; D008922:Mississippi; D009032:Mosquito Control; D012621:Seasons
chemical_list: D000914:Antibodies, Viral