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.
(JAMA 237:2294-2298, 1977)
Powell KE, Blakey DL. St Louis Encephalitis: The 1975 Epidemic in Mississippi. JAMA. 1977;237(21):2294–2298. doi:10.1001/jama.1977.03270480034015
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