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Staphylococcus lugdunensis Infections: High Frequency of Inguinal Area Carriage

Laboratoire de Microbiogie,¹ Service de Chirurgie Plastique, Faculté de Médecine, Hôpital Trousseau, 37044 Tours, France²

Received 4 October 2002/ Returned for modification 4 November 2002/ Accepted 10 January 2003

Following a change in surgical practice, we noted that the rate at which Staphylococcus lugdunensis was isolated from samples from the plastic surgery unit of our hospital increased considerably. We investigated the sources of these S. lugdunensis strains, and we found that in the case of drain colonization or surgical site infection, the strain was more likely to have come from the patient's skin bacteria when the pubic site had been shaved preoperatively. To test the hypothesis of pubic site colonization, we evaluated the prevalence of S. lugdunensis carriage among the cutaneous flora of the inguinal area. We found that 22% of 140 incoming patients carried S. lugdunensis in this area and that carriage at both inguinal folds was frequent (68% of carriers). A study of the genetic structure of the total population, including the clinical (n = 18) and the commensal (n = 53) strains, revealed that the diversity of the species was low and that the population was composed of two major groups that diverged at a distance of 35%. No particular characteristics made it possible to distinguish between clinical and commensal strains. Only isolates producing ß-lactamase were homogeneous; six of the eight ß-lactamase-positive strains displayed the same pulsed-field gel electrophoresis pattern.

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