Two hundred and two strains of prompt lactose‐fermenting enterobacteria were examined, using 12 biochemical tests. In addition the susceptibility to several antibiotics was recorded. Identification on the basis of H2S production, ornithine decarboxylase activity, motility and citrate utilization (HOMoC) was compared with the results obtained using the classical IMV iC tests: indol, methyl red, Voges‐Proskauer and citrate. Only the former set of reactions seemed suitable for clear‐cut identification of the 4 genera Escherichia, Citrobacter, Enterobacter and Klebsiella. In showing low sensitivity to cephalotin Citrobacter and Enterobacter seemed to differ from the other 2 genera, and this could be used as an additional criterion for their identification.
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Gloss et al. (1971) studied this question.
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