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Philadelphia on Monday became the first major US city to reinstate its indoor mask mandate after reporting a sharp increase in coronavirus infections, with the city’s top health official saying she wanted to forestall a potential new wave driven by an Omicron sub-variant.
Confirmed Covid-19 cases had risen more than 50% in 10 days, the threshold at which the city’s guidelines called for people to wear masks indoors, said Dr Cheryl Bettigole, the Philadelphia health commissioner.
Health officials believe the recent wave is being driven by the highly transmissible BA.2 sub-variant of Omicron, which has spread rapidly throughout Europe and Asia and has become dominant in the US in recent weeks.
home to the Liberty Bell, a historic icon of America’s freedom and independence. It is also home to Independence Hall, where the U.S Constitution was written and where the Declaration of Independence was signed.