Expression of the
psmα, hla, RNAIII,
genes in different MLST-type and SPA-type isolates. The expression of key genes was measured by qRT–PCR of cultures grown to the early phase of stationary growth in TSB. gyrB cDNA was used as an endogenous control. USA300 was used as a normalized control to measure sample expression. Data was normalized by transforming the data by log10 (gene expression values). The results are the means of each group and are presented as means ± standard errors of the means. *: p <0.05, **: p <0.01, ***: p <0.001 (one-way ANOVA, Dunnett’s multiple comparison test vs. ST59).