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epa09164668 People receive the second dose of the Sinovac COVID-19 vaccine at a school in Bangkok, Thailand, 28 April 2021. A group of workers considered to be high risk, linked to a cluster around entertainment venues received the second dose of the Sinovac COVID-19 as authorities continue their efforts to contain the third wave of COVID-19 infections. (KEYSTONE/EPA/DIEGO AZUBEL)