Différenciation rapide des colonies de colibacilles parmi les colonies de coliformes

Abstract - A new test is proposed to differenciate E. coli from other coliforms.
Colonies from selective plates were subcultured in a peptone water for indol test and in a malonate broth, incubated at 37° C for 24 hr. The results were compared to Mackenzie, Gilbert and Taylor's for 637 strains sampled in 2 666 coliforms isolated from several types of each of the following: cheeses, milk, cream, sea-water, streams, sewage and stool specimens of calves and chickens. The particular interest of the experiment is that it allows a very precise distinction between E. coli and K. pneumoniae var. oxytoca