In a cross-sectional evaluation of healthcare worker reuse of their own 3M N95 respirators, 83% (76/92) passed the seal check and the fit-test after a median of 40 repeated donnings. User seal-check failure correlated with fit-test failure, and it may help HCWs recognize when to appropriately discard a reused N95.
N95 Filtering Facepiece Respirators Remain Effective After Extensive Reuse During the COVID-19 Pandemic