Some US cities and companies are reintroducing face mask requirements, even for people who are fully vaccinated, in an effort to counter a jump in Covid-19 infections caused by the more transmissible Delta variant of the virus.
San Francisco and six other Bay Area counties on Monday reinstated a universal mask mandate for indoor public places.
“Indoor masking is a temporary measure that will help us deal with the Delta variant, which is causing a sharp increase in cases, and we know increases in hospitalisations and deaths will follow,” said Naveena Bobba, San Francisco’s acting health officer.
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