Streptococcus intestinalis, a New Species from the Colons and Feces of Pigs

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Abstract
A new species of Streptococcus, Streptococcus intestinalis, which accounted for 50% or more of the bacterial population in the colons of pigs and was also isolated from pig feces, is described. Isolates of S. intestinalis were anaerobic to aerotolerant, nonmotile, nonsporing, gram-positive cocci. All strains were .beta.-hemolytic and hydrolyzed urea. Ammonia did not serve as a sole nitrogen source for S. intestinalis, nor did the addition of ammonia to the culture medium affect urease activity. Of 130 strains tested, 29 reacted with rabbit antiserum prepared against Lancefield group G streptococci. The remaining strains did not react with any Lancefield group antiserum. The guanine-plus-cytosine content of the deoxyribonucleic acid ranged from 39 to 40 mol%. A culture of the type strain (strain 76-84-1) has been deposited in the American Type Culture Collection as strain ATCC 43492.