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Infect Immun. 1971 March; 3(3): 504-505
Copyright © 1971 American Society for Microbiology. All Rights Reserved.
1 Aerobiology and Evaluation Laboratories, Fort Detrick, Frederick, Maryland 21701
ABSTRACT
The method of derivation and virulence of a new attenuated variant (ABG) obtained during passage of the virulent Borg strain in embryonated eggs in the presence of p-aminobenzoic acid are described.
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