The characterization of fluorescent skin diphtheroids

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Abstract
Twenty strains of Corynebacterium minutissiinum isolated from cases of erythrasma have been compared with 21 strains of fluorescent diphtheroids isolated from normal skin and 14 strains isolated from skin of dermatological patients. Features including morphological colonial characteristics and biochemical activities were used to determine the relationship between these organisms. All strains of C. minutissimum were morphologically and culturally identical with fluorescent diphtheroids isolated from normal skin and from skin of dermatological patients. Biochemical features proved to be variable in strains of C. minutissimum and all fluorescent diphtheroids regardless of source. None of the features examined differentiated between strains of C. minutissimum and fluorescent skin diphtheroids. Culture collection strains of Corynebacterium xerosis, Corynebacterium enzymicum, Corynebacterium hoagii, Corynebacterium pseudodiphtheriticum, and Corynebacterium pseudotuberculosis were examined in the same way. Fluorescence could not be demonstrated in these strains. The 51 strains of C. minutissimum and fluorescent skin diphtheroids were culturally and biochemically distinct from all culture collection strains of Corynebacterium except C. xerosis.

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