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The clinicians said wearing facemasks outdoors should apply in settings where it is difficult to physically distance and where several households are mixing for a prolonged time PEOPLE should be asked to wear face coverings when attending large outdoor gatherings such as sporting events to prevent Covid super-spreading, researchers have argued. Writing as part of a debate in the BMJ today, clinicians from California and Switzerland say the policy makes sense in settings where it is difficult to maintain physical distance for prolonged periods . Although they acknowledge that the estimated risk of transmission is four to 20 times more likely indoors than outdoors, they conclude that mandating facemasks outdoors when people are mixing with several other household groups helps to make it a normalised behaviour.

United kingdomUnited statesSan diego state universitySouth dakotaBabak javidDirk basslerMuge cevikAnthony brookesManuelb bryantUniversity hospital zurichDivision of experimental medicineUniversity of california ucalSt andrews universityVirus threats advisory groupPublic health englandUnited kingdom department of health