SARS-CoV-2 in the hospital environment and risk of COVID-19 nosocomial transmission A document produced by SAGE states the following. Evidence on efficacy of cloth face-coverings (non-medical masks): There is limited evidence regarding the respiratory protection that non-medical / homemade masks can offer for the wearer, and there are no established quality standards for self-made face … Continue reading Limited evidence regarding the respiratory protection using non-medical / homemade masks – SAGE