Two masks can be worse than one: N95 respirator failure caused by an overlying face mask

Jeffrey T. Mueller, Holly D. Geyer,Soroor Karimi,Karl A. Poterack,Maria Teresa A. Seville,Skye Buckner Petty,Steven M. Tipton

Infection Control & Hospital Epidemiology（2022）

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摘要

Abstract We have demonstrated the effect of covering an N95 filtering facepiece respirator (FFR) with an overlying face mask. In total, 100 participants successfully completed quantitative fit testing wearing a 3M 1870+ FFR. Among them, 13 (13%; 95% CI, 7%–22%) failed subsequent fit testing when simultaneously wearing a Halyard 47117 procedural mask over the FFR.

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