Propionibacterium Acnes Persists Despite Various Skin Preparation Techniques.

PURPOSE: To investigate the efficacy of various skin preparations at eradicating Propionibacterium acnes in the dermal layer of the skin.

METHODS: Twelve healthy volunteers consented to participate in this study. Each subject's upper back was prepped using 4 different techniques: an isopropyl alcohol control, chlorhexidine gluconate paint, chlorhexidine gluconate plus a mechanical scrub, and a high-concentration chlorhexidine gluconate plus a mechanical scrub. A 3-mm dermal punch biopsy specimen was obtained at each preparation site. The 4 punch biopsy specimens were cultured for 14 days to assess for P. acnes growth. A Fisher's exact test was used to compare the proportion of positive cultures in each group and across biopsy sites. A Skillings-Mack test was used to compare the degree of culture positivity between the treatment arms.

RESULTS: There were no reported complications in any of our subjects. P. acnes grew in 7 of the 12 control sites, 5 of the 12 chlorhexidine gluconate sites, 6 of the 12 chlorhexidine plus mechanical scrub sites, and 6 of the 12 high-concentration chlorhexidine gluconate plus mechanical scrub sites. There were no statistically significant differences between any of the treatment arms (P = .820).

CONCLUSIONS: P. acnes persisted despite a variety of clinically relevant skin antisepsis preparations and techniques.

LEVEL OF EVIDENCE: Level II, prospective comparative study.