Reusing PPE is not recommended but was common during COVID-19 pandemic. Limited guidance on proper PPE use and its reuse heightened the hazards to health care worker (HCW) safety. Emerging data on PPE use suggests that most HCWs were contaminated by donning and doffing of PPE while adhering to standards of care.

A prospective observational study was conducted to understand HCW behaviors in donning, doffing, and reusing PPE. Emergency Department physicians and nurses were video-recorded donning, doffing, and reusing PPE within a simulated acute care environment. Participants performed five donning and doffing PPE procedures. PPE kit included gown, face shields, and N95 respirator masks. Participants had access to disposable gloves and hand sanitizer. Recordings were reviewed and coded independently by two trained coders based on checklist of key behaviors. Agreement between coders was high (81.9%). All participants reported completing PPE training.

28 videos of participants capturing 278 procedures were reviewed. None of the participants followed the CDC’s order for donning across five scenarios. Majority of participants failed to perform hand hygiene before donning or re-donning PPE or when doffing PPE. For contaminant spread risk, 92.85% (n=26) touched patient-facing side of PPE during re-donning and/or doffing PPE (M= 3.75, SD= 2.37, Median = 4; 0-9 times). The most common area of self-contamination was hands (n= 111 across all participants in 5 donning/doffing sequences). Touching patient-facing side of PPE was more likely to occur during donning than doffing (70.5% vs. 20.1% of sequences).

The study found wide variation in PPE donning/doffing practices among HCW in violation of CDC guidance. This first study to review PPE reuse through a human factors lens, identifyied deviant behaviors that contribute to HCW self-contamination. Efforts are needed to redesign PPE and develop effective ways to train staff using PPE equipment safely.