Study: Double masking improves protection from Covid-19 mostly by eliminating any gaps or poor-fitting areas of a mask
18 Apr, 2021 | 21:37h | UTCFitted Filtration Efficiency of Double Masking During the COVID-19 Pandemic – JAMA Internal Medicine
Commentaries: Fit matters most when double masking to protect yourself from COVID-19 – University of North Carolina Health Care AND Check your fit on that double mask if you want it to work against Covid, study says – CNN