Efficacy of face mask in preventing respiratory virus transmission: A systematic review and meta-analysis.

Travel Med Infect Dis · 2020 · PMC7253999 · PMID 32473312

Europe PMC DOI

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might not be significantno p-value reported

However, this effect might not be significant, as 92% of patients with clinical SARS for whom paired sera were available had a >4-fold rise in antibody titer to SARS-CoV [ 57 ].

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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.