The S. aureus 8325–4 wild type (WT) strain and its isogenic srtA deletion mutant (srtA KO) were used in this study. The srtA mutant was generated by srtA:ermC allele transduction, as previously described [9 (link), 13 (link)]. The srtA KO mutant was selected and maintained on brain-heart infusion agar (BHA, BD (Becton Dickinson and Company)-Difco, Etten-Leur, The Netherlands) plates supplemented with 3 μg/ml erythromycin (Abbott Laboratories, North Chicago, Illinois, U.S.).
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