Objectives: The oral cavity may represent a site of colonization by antibiotic-resistant bacteria, such as methicillin-resistant staphylococci (MRS). To define the prevalence of staphylococci and MRS in the oral cavity, an observational study was carried out in the city of Bari (Italy).
Methods: Sixty subjects were asked to provide oral samples and a questionnaire about risk factors of colonization by MRS. An enrichment medium specific for staphylococci was used for the isolation.
Results: Swabs and corresponding questionnaires were available from 36 out of 60 patients. Staphylococci were isolated from seven out of 36 samples (prevalence 19.4%). Among the seven staphylococcal isolates, three were Staphylococcus aureus, and one strain, belonging to S. epidermidis species, was found to be MR (1.7%). No methicillin-resistant S. aureus were isolated. Five out of seven staphylococcal isolates exhibited resistance to more than two classes of non-beta-lactams antimicrobials. None of the risk factors analysed correlated with the status of MRS carriers, except the presence of oral disease.
Conclusions: The results underline the potential role of the oral cavity as a reservoir of staphylococci.