Strains ofStreptococcus lactiswhich contain β-galactosidase

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Abstract
In the past the classification of ATCC 7962 as a strain of Streptococcus lactis has been questioned because it contains β-galactosidase and not β-phosphogalactosidase, and because all extracts do not react with group N antiserum. A comparison was made between ATCC 7962 and known strains of Str. lactis using physiological properties, some of the properties of the lactate dehydrogenases and percent guanine plus cytosine in the DNA. ATCC 7962 was distinguished only by its ability to ferment pentoses. The degree of hydribization between the DNA of ATCC 7962 and that of a typical strain of Str. lactis was 67 %. ATCC 7962 is an atypical strain of Str. lactis. The properties of a wild strain of Str. lactis isolated from radishes in Brunei which contains β-galactosidase and β-phosphogalactosidase, are given also. This strain ferments pentoses.