Surgical masks as source of bacterial contamination during operative procedures.

Statistical differences were analysed using one-way analysis of variance followed with Dunnett post hoc test; “*” indicates a significant difference ( p < 0.05), and “**” indicates a highly significant difference ( p < 0.01).

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With wearing time extension, an increasing trend can be seen in the CFUs from the surface of SMs ( Fig. 2 A).

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