The Production of Large Amounts of a Polysaccharid by Streptococcus salivarius

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Abstract
Many cultures of Strep. salivarius produce a large amt. of a polysaccharide from sucrose, resulting, when grown on solid media, in the formation of large mucoid colonies. The material is also produced in liquid media. The mucoid material is likewise produced from raffinose, but not from the other carbohydrates tested. In the salivarius group, the ability to produce the polysaccharide from sucrose appears to be correlated with the ability to ferment inulin, though the mucoid material is not produced from inulin. Large mucoid colonies were not produced on sucrose agar by cultures of the other groups and species of hemolytic and non-hemolytic streptococci, including many inulin-fermenting strains. However, a somewhat similar material may rarely be produced from sucrose by strains of Strep. bovis.

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