A health worker receives a dose of COVID-19 vaccine from China in Istanbul, Turkey, Jan. 14, 2021. Turkey launched Thursday the mass vaccination program against COVID-19 with the vaccines developed by China's Sinovac company. According to the Turkish Health Ministry, the first doses will be given to over 1 million health workers across the country, followed by adults living in nursing homes. (Photo by Osman Orsal/Xinhua)