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October 1970

Bacteriology of Acne Comedones

Author Affiliations


From the Department of Dermatology, University of Pennsylvania School of Medicine, Philadelphia.

Arch Dermatol. 1970;102(4):397-399. doi:10.1001/archderm.1970.04000100045010

The bacteria within open and closed comedones were evaluated quantitatively and the cocci classified by the Baird-Parker scheme. Corynebacterium acnes and gram positive cocci were always present. The anaerobes greatly outnumbered the aerobes in both types. C acnes was more numerous in closed comedones. Staphylococcus type II (SII) was the predominant member of the coccal flora. Micrococcus isolates were rare.

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