SUMMARY: Virulent strains of (formerly ) are the aetiologic agents of gaffkemia, a septicaemic disease of the American lobster (). The virulent and avirulent forms of this bacterium, previously thought to be taxonomically indistinguishable, have been differentiated by serological studies. Antisera were produced in rabbits using autoclaved bacteria as antigens. Reactions were measured by agglutination tests using microtitre techniques and an antigenic scheme was determined. Specific antisera were prepared by absorption and used to determine antigens of strains of and other Gram-positive cocci. In general, only virulent strains of have antigen b. Both virulent and avirulent strains possess other antigens also detected in strains of the genus


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