The SARS-CoV-2 viral load in COVID-19 patients is lower on face mask filters than on nasopharyngeal swabs.

Sci Rep · 2021 · PMC8242000 · PMID 34188082

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an increasing trendno p-value reported

4 for breath pre-exposed filters, the Ct values for SARS-CoV-2 qRT-PCR showed an increasing trend from time 0 to 48 h.

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