A medical worker prepares a dose of the COVID-19 vaccine at the San Filippo Neri Hospital in Rome, Italy, Dec. 28, 2020. (Photo by Alberto Lingria/Xinhua)
A man receives an injection of the COVID-19 vaccine at the San Filippo Neri Hospital in Rome, Italy, Dec. 28, 2020. (Photo by Alberto Lingria/Xinhua)
A medical worker receives an injection of the COVID-19 vaccine at the San Filippo Neri Hospital in Rome, Italy, Dec. 28, 2020. (Photo by Alberto Lingria/Xinhua)
Medical workers prepare a dose of the COVID-19 vaccine at the San Filippo Neri Hospital in Rome, Italy, Dec. 28, 2020. (Photo by Alberto Lingria/Xinhua)
A medical worker prepares a dose of the COVID-19 vaccine at the San Filippo Neri Hospital in Rome, Italy, Dec. 28, 2020. (Photo by Alberto Lingria/Xinhua)