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Am. J. Trop. Med. Hyg., 32(2), 1983, pp. 412-416
Copyright © 1983 by The American Society of Tropical Medicine and Hygiene

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St. Louis Encephalitis—Florida 1977

Patterns of a Widespread Outbreak*

David B. Nelson{dagger}, Karl D. Kappus{dagger}, Henry T. Janowski{ddagger}, Elsie Buff{ddagger}, F. M. Wellings{ddagger} AND N. J. Schneider{ddagger}
{dagger} Viral Diseases Division, Center for Infectious Diseases, Centers for Disease Control, Atlanta, Georgia, 30333
{ddagger} State of Florida, Department of Health and Rehabilitative Services, 1317 Winewood Boulevard, Tallahassee, Florida 32301

From 8 August through 5 December 1977, 110 laboratory-documented cases (78 confirmed, 32 presumptive) of St. Louis encephalitis (SLE) occurred in 20 counties throughout central-south Florida. Most cases were initially identified through an active surveillance system involving repeated contact of hospital infection control officers. This outbreak had three characteristics that are unusual for SLE epidemics in the eastern United States: it lacked an urban focus, a disproportionate number of cases affected young males, and the epidemic period extended into December. There was no significant difference between attack rates for blacks and whites. Males were significantly more often affected than females. Because of the time required for laboratory confirmation of cases, most outbreak control measures were initiated after the outbreak was declining. Reporting of clinically suspected SLE cases to initiate epidemic mosquito control should improve the timeliness of control measures in future outbreaks.

Accepted for publication August 13, 1982.


* Address reprint requests to: Karl D. Kappus, Ph.D., Influenza Branch, 7-112, Centers for Disease Control, Atlanta, Georgia 30333.






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