Figure 1

<p>A: Three sizes of diameter punch (0.5-mm, 1-mm, 2-mm) involving higher and lower bacteria concentrations for PCR. −6 stands for 60 CFU ml<sup>−1</sup>, −1 stands for 6×10<sup>6</sup> CFU ml<sup>−1</sup>; B: Standard curve of real-time quantitative PCR of 6 decimal dilutions of representative Staphylococcus aureus ranging from 6×10<sup>4</sup> to 6×10<sup>9</sup> CFU ml<sup>−1</sup>.</p>