This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Reprints and Permissions Copyright Information Books from ASM Press MicrobeWorld Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Vowels, B. R. Articles by Leyden, J. J. Search for Related Content PubMed PubMed Citation Articles by Vowels, B. R. Articles by Leyden, J. J.

 Previous Article  |  Next Article 

Antimicrobial Agents and Chemotherapy, Nov 1996, 2598-2604, Vol 40, No. 11
Copyright © 1996 by the American Society for Microbiology. All rights reserved.

Effects of topical erythromycin on ecology of aerobic cutaneous bacterial flora

BR Vowels, DS Feingold, C Sloughfy, AN Foglia, N Konnikov, E Ordoukhanian, P Starkey and JJ Leyden
Department of Dermatology, School of Medicine, University of Pennsylvania, Philadelphia 19104-6142, USA.

We have demonstrated previously that application of topical erythromycin, an antibiotic commonly used for the treatment of acne, results in an increased density of cutaneous erythromycin-resistant (Emr) coagulase-negative staphylococci; however, it is unknown if this increase results in an overall higher density of total cutaneous staphylococci or if upon cessation of erythromycin use, Emr coagulase- negative staphylococci remain at an increased density compared with the pretreatment density. To investigate this, 2% erythromycin or vehicle was applied to each subject's forehead (n = 225) twice a day by laboratory personnel for a period of 6 weeks. Samples were obtained for culture from the forehead, anterior nares, and back of the subjects at baseline and at weeks 6, 9, and 12 of the study. Cultures were performed on differential media. Plates into which erythromycin was incorporated (8 micrograms/ml) were used to identify Emr coagulase- negative staphylococci. The species of all Emr coagulase-negative staphylococci were determined, and an antibiogram for 16 antibiotics was obtained. The baseline prevalence of Emr coagulase-negative staphylococci on the forehead and nose was about 80% at the two study sites, whereas that on the back was 50%. The baseline density of Emr coagulase-negative staphylococci on the forehead, nose, and back was approximately 20% of the total flora. Following 6 weeks of erythromycin treatment, the prevalence of Emr coagulase-negative staphylococci on the forehead and nose was nearly 100% and the densities were 73 and 62%, respectively; the prevalence and density for the back were 78 and 42%, respectively. The most prevalent erythromycin resistance gene expressed by the Emr coagulase-negative staphylococci was ermC. There was no increase in the numbers of Staphylococcus aureus, gram-negative rods, or yeasts, nor was there increased resistance to any other antibiotic except clindamycin. The density of total aerobic organisms also remained static. There were no changes in the prevalence or density of Emr coagulase-negative staphylococci in the vehicle group. A statistically significant decrease in the prevalence and density of Emr coagulase-negative staphylococci in the erythromycin group was observed within 3 weeks posttreatment and by 6 weeks posttreatment, the prevalence and density returned to baseline values. These data demonstrate that the increased prevalence and density of Emr coagulase- negative staphylococci as a result of topical 2% erythromycin use are transient on both population and individual levels.

This article has been cited by other articles:

• Margolis, D. J., Bowe, W. P., Hoffstad, O., Berlin, J. A. (2005). Antibiotic Treatment of Acne May Be Associated With Upper Respiratory Tract Infections. Arch Dermatol 141: 1132-1136 [Abstract] [Full Text]  
• Levy, R. M., Huang, E. Y., Roling, D., Leyden, J. J., Margolis, D. J. (2003). Effect of Antibiotics on the Oropharyngeal Flora in Patients With Acne. Arch Dermatol 139: 467-471 [Abstract] [Full Text]