title: Effects of topical erythromycin on aerobic and anaerobic surface flora.
abstract: The contents of acne lesions from 30 men with inflammatory acne vulgaris, obtained before and at the conclusion of 4 weeks of topical 2% erythromycin therapy, were cultured on aerobic and anaerobic plates. Sensitivity testing of cultures was performed with discs containing 50 mg erythromycin, in order to ascertain the prevalence of erythromycin-resistant strains of Propionibacterium acnes and aerobic micrococci. The percentages of patients in whom erythromycin-resistant micrococci could be isolated increased from 3 to 60% during topical erythromycin therapy, but no resistant P. acnes strains were isolated either before or after therapy. Considering the widespread use of topical antibiotics, long-term studies on their ecological effects are desirable.
mesh_terms: D000152:Acne Vulgaris / Q000188:drug therapy / Q000382:microbiology; D000287:Administration, Topical; D004352:Drug Resistance, Microbial; D004917:Erythromycin / Q000494:pharmacology* / Q000627:therapeutic use; D006801:Humans; D008297:Male; D008837:Micrococcus / Q000187:drug effects*; D011425:Propionibacterium acnes / Q000187:drug effects*
chemical_list: D004917:Erythromycin