Staphylococcus epidermidis isolates from nares and prosthetic joint infections are mupirocin susceptible

Lavin Salih, Staffan Tevell, Emeli Månsson, Åsa Nilsdotter-Augustinsson, Bengt Hellmark, Bo Söderquist, Lavin Salih, Staffan Tevell, Emeli Månsson, Åsa Nilsdotter-Augustinsson, Bengt Hellmark, Bo Söderquist

Abstract

The objective of the present study was to investigate the antibiotic susceptibility including mupirocin among Staphylococcus. epidermidis isolated from prosthetic joint infections (PJIs) (n=183) and nasal isolates (n=75) from patients intended to undergo prosthetic joint replacements. Susceptibility to mupirocin (used for eradication of nasal carriership of Staphylococcus aureus) was investigated by gradient test, and susceptibility to various other antimicrobial agents was investigated by disc diffusion test. All isolates, except three from PJIs and one from the nares, were fully susceptible to mupirocin. Multi-drug resistance (≥3 antibiotic classes) was found in 154/183 (84.2%) of the PJI isolates but only in 2/75 (2.7%) of the nares isolates, indicating that S. epidermidis causing PJIs do not originate from the nares.

Keywords: Antibiotic susceptibility testing; Mupirocin; Prosthetic joint infections; Staphylococcus epidermidis.

Conflict of interest statement

Competing Interests: The authors have declared that no competing interest exists.

Figures

Figure 1
Figure 1
Distribution of minimum inhibitory concentrations (MICs) of mupirocin among S. epidermidis isolates obtained from prosthetic joint infections (a) and from nares (b). The breakpoints for nasal decolonization of S. aureus according to NordicAST (http://www.nordicast.org) is S ≤1 mg/L and R >256 mg/L, respectively.

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Source: PubMed

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