A medical worker receives a booster shot of the Pfizer COVID-19 vaccine Wednesday, December 1, 2021, at Fujita Health University Hospital, in Toyoake city, central Japan. Japan on Wednesday started offering booster shots of coronavirus vaccine, starting with healthcare workers, to further bolster immunity in the country amid growing concerns about a new variant of the virus. (Photo by Mizuki Ikari/Kyodo News via AP Photo)
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