The thermocycling protocol for toxin genes included an initial denaturation at 95 °C for 5 min, followed by 30 cycles of denaturation (94 °C for 1 min), annealing (57 °C for 1 min), and extension (72 °C for 1 min), ending with an extension at 72 °C for 7 min. Then 10 μL of the multiplex PCR product was added to a 2% (wt/vol) agarose gel in 1x Tris-acetate-EDTA (TAE) buffer. A 100–10,000 bp ladder was used as a molecular marker. The electrophoresis was run at 100 mV for 1 h and 10 min. The gel was stained for 15 min using ethidium bromide and distained in distilled water for 30 min. The DNA bands were visualized and recorded under UV using a gel documentation system. The expected amplicon band sizes of S. aureus toxin genes are shown in Table 5. At least one PCR amplicon of each positively reported toxin gene was sequenced using the same amplifying primers to ensure the accuracy of the PCR amplification.