Bacteriocine Production in Group B Streptococci

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Abstract
The bacteriocinogeny of 45 bovine and human group B streptococci strains was studied. All 45 strains were examined as producers and indicators. Of the 45 strains tested, 30 (66.6 %) were bacteriocinogenic and 30 (66.6%) were sensitive to bacteriocines. Generally, group B streptococci were weak bacteriocine producers. Bacteriocinogeny and sensitivity to bacteriocines may coexist in the same organism, but sensitivity to a homologous bacteriocine was never observed. Inhibitory activity of bovine strains against other bovine and human strains was stronger than that exerted by strains of human origin. The spectra of activity of the strains tested were narrow. In one strong bacteriocinogenic strain, loss of bacteriocinogeny was observed. Hemolysin production by this particular strain remained unaffected.

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