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Am. J. Trop. Med. Hyg., 23(6), 1974, pp. 1131-1139
Copyright © 1974 by The American Society of Tropical Medicine and Hygiene

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Lassa Fever in the Eastern Province of Sierra Leone, 1970–1972

I. Epidemiologic Studies*

David W. Fraser, C. Clinton Campbell, Thomas P. Monath, Paul A. Goff AND Michael B. Gregg
The Bureau of Epidemiology, the State and Community Services Division, and the Bureau of Laboratories, Center for Disease Control, Public Health Service, U. S. Department of Health, Education and Welfare, Atlanta, Georgia 30333, and the Peace Corps, Freetown, Sierra Leone

In an epidemic of Lassa fever in the Eastern Province, Sierra Leone, 63 suspected cases were identified in patients admitted to two hospitals over a 2-year period. Although hospital workers were at high risk of infection, most cases were acquired outside the hospital. There appeared to be intrafamilial outbreaks around several cases. The clustering of seropositivity in families suggested person-to-person spread. Six percent of the population surveyed had complement-fixing antibody against Lassa virus, while only 0.2% had recognized disease. This suggests that the fatality from Lassa virus infection is considerably less than the 38% observed among cases.

Accepted for publication February 23, 1974.


* Address reprint requests to: David W. Fraser, M.D., Bureau of Epidemiology, Center for Disease Control, Atlanta, Georgia 30333.




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Copyright © 1974 by the American Society of Tropical Medicine and Hygiene.