Minimizing Aerosol Leakage from Facemasks in the COVID-19 Pandemic.

Aerosol therapies with vented facemasks are considered a risk for nosocomial transmission of viruses such as severe acute respiratory syndrome coronavirus 2. The transmission risk can be decreased by minimizing aerosol leakage and filtering the exhaled air. In this study, we determined which closed facemask designs show the least leakage.