Bracing for Omicron: California mask rules return as US Covid-19 cases hit 50 million

California will impose a statewide mask mandate in all indoor public spaces as Covid-19 case rates soar and as precautions ramp up against the Omicron variant.The United States on Monday hit 50 million Covid-19 cases, according a tally by Johns Hopkins University, with the number of coronavirus-related deaths approaching 800,000.The nation is bracing itself for a potential surge in infections because of more time spent indoors with winter holidays and colder weather, and the highly…

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