Do physical measures such as hand-washing or wearing masks stop or slow down the spread of respiratory viruses? slow down the spread of respiratory viruses? Ke

Do physical measures such as hand-washing or wearing masks stop or slow down the spread of respiratory viruses? slow down the spread of respiratory viruses? Key messages We are uncertain whether wearing masks or N95/P2 respirators helps to slow the spread of respiratory viruses based on the studies we assessed. Hand hygiene programmes may help to slow the spread of respiratory viruses.