Relative efficacy of masks and respirators as source control for viral aerosol shedding from people infected with SARS-CoV-2: a controlled human exhaled breath aerosol experimental study.

2 ), all masks and respirators conferred statistically significant reductions (p < 0.05) in viral load for fine, coarse, and total aerosols, except that cloth mask was only borderline significant (p = 0.063) for coarse aerosols.

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The direction of the effect was consistent, but the comparison did not reach statistical significance when analysis was restricted to the individual fine and coarse aerosol size fractions ( Supplementary Tables S3a and 3b ) and for total aerosol RNA when the off-brand KN95s were excluded ( Supplementary Table S3c ).

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