Cotton and Surgical Face Masks in Community Settings: Bacterial Contamination and Face Mask Hygiene.

Front Med (Lausanne) · 2021 · PMC8446422 · PMID 34540873

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showed a trendno p-value reported

After 4 h of mask wearing, the microbiome of the anterior nares and the cheek showed a trend toward an altered beta-diversity.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.