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Abstract
SUMMARY: Strains of Streptococcus pluton (White) from widely separate parts of the world were very similar culturally and serologically and differed greatly in these respects from associated enterococci. S. pluton was satisfactorily isolated only on a yeast + glucose + potassium phosphate + starch medium incubated anaerobically +CO2. Oxidation potentials in agar of this medium were very stable for which the high concentration of phosphate, together with yeast and glucose, was necessary. In deep agar incubated aerobically, S. pluton started to grow only within a narrow range of Eh values. It did not grow on ordinary bacteriological media but was adapted to grow on the special agar in air + CO2. Adapted strains grew on the special agar in a limited volume of air and produced CO2.
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