Abstract
Six streptococci isolated in high numbers from different mastitis samples have been identified as strains of Streptococcus bovis. The properties of the strains were compared with those strains of Strep, bovis from culture collections and also with those of two strains of Strep. mutans. Physiological properties, including ability to form capsules and dextran, the properties of the lactate dehydrogenases and hybridization between the deoxyribonucleic acid of the unknown strains and the reference strain of Strep. bovis were determined. It is concluded that Strep. bovis comprises strains with heterogeneous properties. No subgroups were apparent. The pathogenicity to the udder was determined for eight strains of Strep. bovis and one of Strep. mutans.
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