Coliform Intermediates in Human Feces

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Abstract
On the basis of production of indole, methyl-red and Voges-Proskauer re- actions, and utilization of citrate, 765 bacterial strains from human feces were designated as coliform intermediates. The results of a detailed study of these strains are presented and their relations to the coli and aerogenes groups are discussed. The heterogeneity of the coliform intermediate group is emphasized and a simple classification of coliform bacteria is suggested. The frequent occurrence of coliform intermediates in human feces is demonstrated and their significance as indicators of fecal pollution is discussed.