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Appl Environ Microbiol. 1974 April; 27(4): 777-783
Copyright © 1974 American Society for Microbiology. All Rights Reserved.
1 U.S. Army Medical Research Institute of Infectious Diseases, Frederick, Maryland 21701
ABSTRACT
The attenuated M-44 strain of Coxiella burneti was heated to free it of adventitious agents that may have been present. Parallel titrations of the strain before and after heating indicated that the virulence for guinea pigs was markedly decreased. Guinea pigs immunized with the strain derived after heat treatment were protected from the effects of challenge with C. burneti in either phase I or II.
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