The biochemical reactions, antibiotic sensitivities, phage susceptibility and morphologic features of nine anaerobic corynebacteria, obtained from the American Type Culture Collection and Dr. A-R Prévot (identified in these collections as and were examined over an 18 month period. Many biochemical characteristics varied on repeated examination. All organisms were highly sensitive to 7 antibiotics and all but one of those tested were susceptible to a single phage. Size and morphology varied under different conditions. Review of the literature showed much disagreement on the characteristics of each organism. It was concluded that conventional routine methods do not permit their recognition as individual species, and that they should be regarded as variants of .


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