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SUMMARY: Fifty-nine strains labelled Corynebacterium parvum were investigated by cell-wall agglutination tests using antisera to Propionibacterium acnes and P. granulosum. Fifty-two strains appeared to be serologically identical with P. acnes and three with P. granulosum; these identifications were confirmed by the results of fermentation and other metabolic tests. Of the remaining four strains, three were identified as P. avidum by fermentation tests, and by DNA/DNA homology determinations against reference strains of P. avidum, P. acnes and P. granulosum. One strain was identified as Actinomyces, probably A. naeslundii. These results indicate that C. parvum should be regarded as a synonym of P. acnes.
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Cummins et al. (1974) studied this question.
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