Efficacy of face masks and respirators in preventing upper respiratory tract bacterial colonization and co-infection in hospital healthcare workers.

Prev Med · 2014 · PMC7172205 · PMID 24472436

Europe PMC DOI

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did not reach statistical significanceno p-value reported

The MM arm had a higher rate of dual virus infection than controls, but the difference between MM and control did not reach statistical significance.

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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.