Methicillin-resistant S. aureus strain obtained from ATCC (strain number 33592) was tested. Staphylococcus epidermidis and S. aureus clinical isolates (n = 57) were obtained from the Microbiology Laboratories of University of Padova and University of Urbino and subjected to morphological, biochemical, and molecular typing as described elsewhere (Hall et al., 2013 (link)). The strains were grown in Lysogeny broth (LB) (Becton Dickinson).
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