Variation of type Antigens of Group-B Streptococci

Abstract
During the natural course of bovine mastitis caused by Group-B streptococci loss or gain of the Ibc-protein antigen was demonstrated on examination of isolates from subsequent samplings. Thus, “genuine” Ibc-stnains may arise from Ib, II Ibc, III Ibc and possibly from Ic-strains by loss of polysaccharide antigen or from non-typeable strains by acquisition of the Ibc-antigen. Variations were not provoked by ordinary laboratory procedures, but probably induced in vivo by specific antibodies.

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