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Am. J. Trop. Med. Hyg., 19(5), 1970, pp. 851-859
Copyright © 1970 by The American Society of Tropical Medicine and Hygiene

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Studies of Arthropod-Borne Virus Infections in Chiroptera

VIII. Evidence of Natural St. Louis Encephalitis Virus Infection in Bats*

Rae Allen, Stanley K. Taylor AND S. Edward Sulkin
Department of Microbiology, The University of Texas Southwestern Medical School, Dallas, Texas 75235

During, and for several months after, epidemics of St. Louis encephalitis in Houston, Texas, in 1964 and in Corpus Christi, Texas, in 1966 Mexican free-tailed bats (Tadarida brasiliensis) were collected at intervals in these areas in south Texas and tested for evidence of infection with St. Louis encephalitis virus. Twenty-six strains of the virus were isolated from the blood or spleen tissue of 1.649 bats tested, and neutralizing antibodies against this agent were detected in 25 of 275 plasma samples from bats netted near Houston and in 108 of 388 plasma samples from bats collected in Corpus Christi. St. Louis encephalitis virus was isolated from bats collected in virtually every month of the year, demonstrating the persistence of infection with SLE virus in this bat species throughout the observation period. Rio Bravo virus and several as yet unidentified viruses were also isolated from the bats.

Accepted for publication January 19, 1970.


* This investigation was conducted under the sponsorship of The Commission on Viral Infections, Armed Forces Epidemiological Board, and was supported by the U.S. Army Medical Research and Development Command, Department of the Army, under Contract No. DA-49-193-MD-2138. In conducting the research project, the investigators adhered to "Principles of Laboratory Animal Care" as established by the National Society for Medical Research.






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