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American Journal of Epidemiology Vol. 102, No. 1: 1-15
Copyright © 1975 by The Johns Hopkins University School of Hygiene and Public Health

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THE EPIDEMIOLOGY OF ST. LOUIS ENCEPHALITIS IN DALLAS, TEXAS, 1966

CYRUS C. HOPKINS1 , F. BLAINE HOLLINGER2 , RONALD F. JOHNSON3 , HAL J. DEWLETT4 , VERNE F. NEWHOUSE5  and ROY W. CHAMBERLAIN6

1Viral Diseases Division, Bureau of Epidemiology, Center for Disease Control Atlanta, GA
2Virology Division, Bureau of Laboratories, Center for Disease Control Atlanta, GA
3Viral Diseases Division, Bureau of Epidemiology, Center for Disease Control Atlanta, GA
4Former Director of Public Health, City of Dallas Health Department Dallas, TX
5Virology Division, Bureau of Laboratories, Center for Disease Control Atlanta,. GA

6To whom requests for reprints should be sent at Virology Division, Bureau of Laboratories, Center for Disease Control, Atlanta, GA 30333.

Hopkins. C. C, F. B. Hollinger, R. F. Johnson. H. J. Dewlett, V. F. Newhouse and R. W. Chamberlain (Center for Disease Control. Atlanta, GA 30333). The epidemiology of St. Louis encephalitis in Dallas, Texas, 1966. Am J Epidemiol 102:1–15. 1975.—An epidemic of St. Louis encephalitis (SLE) occurred in Dallas, Texas, in the summer of 1966. A total of 545 suspected cases within Dallas city and county were reported, of which 145 were laboratory-confirmed as SLE virus infection. The greatest concentration of cases occurred in lower socioeconomic areas of the central part of the city in black populations. The attack rate and mortality rate increased markedly with age. The overall attack rate was 15.2 per 100,000, with a case fatality rate of 9.7%. During the course of the epidemic, most of the county was sprayed aerially with an ultra-low volume (ULV), high-concentration malathion mist. The effects of this treatment cannot be adequately assessed from the human epidemiologic aspect alone, but the spraying clearly reduced the number and infection rate of the vector mosquitoes.

arbovirus infections; encephalitis; St. Louis; mosquito control

Present address: Department of Medicine, Massachusetts General Hospital, Boston, MA 02114.

Present address: Department of Virology and Epidemiology, Baylor College of Medicine, Houston, TX 77025.

Present address: Department of Medicine, Massachusetts General Hospital, Boston, MA 02114.

Present address: 229 Locke Medical Building, 6011 Harry Hines Boulevard, Dallas, TX 75235.

Present address: Center for Disease Control, Ft. Collins, CO 80522.


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