Abstract
From one of the variants (C16) obtained by Nungester and Anderson1 in a study of a recently isolated B. coli-like organism, Nungester2 has in later work obtained 7 additional variants. These agglutinate in similar high dilutions of the parent immune serum but differ from each other in their reactions on lactose, maltose and sucrose Andrade agar as indicated in the table.In carbohydrate broth medium 2 types of reactions occurred: (1) in broths containing the same kind of sugars as in the indicator plates which gave positive reactions, acid was produced in one day; (2) in broths containing the same kind of sugars as in the indicator plates which gave negative reactions, acid production was delayed and appeared after one to 10 days.Jones, Orcutt and Little3 have reported atypical slow lactose fermenting colon bacilli which appear somewhat similar to those described above. Alkalinity was maintained in broth for several days before acid was evident. In all cases, however, quantitative analysis showed that lact...
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