List of PCR primers is shown in Table 1. In brief, 2 ml DNA (DNA extracted using
Qiagen DNA extraction kit) was amplified in a final reaction volume
of 10 ml containing 0.2 mM of S. aureus species-specific primers,
0.2 mM dNTP, 1x reaction buffer (with MgCl2) and 1.25 units of Taq
DNA polymerase. Thermocycler conditions were 95 C for 5 min,
followed by 30 cycles of 94 C for 50 s, 55 C for 30 s, and 72 C for
30 s, and finally 72 C for 7 min. PCR products were analyzed by
1.5% agarose gel electrophoresis.