TOPSHOT - A medical worker prepares a Covid-19 PCR test at East Boston Neighborhood Health Center in Boston, Massachusetts on December 20, 2021. - Boston Mayor Michelle Wu announced that starting January 15, 2022, guest and employees, in the Boston will be required to show proof of vaccination against Covid-19 in order to enter some indoor spaces, including dining venues, bars and nightclubs, fitness centers and any indoor entertainment venues. The new city mandate also requires all city employees to be vaccinated with at least one dose by January 15, and two doses by February 15. (Photo by Joseph Prezioso / AFP)