FILE - In this Feb. 15, 2021 file photo, a teacher gets a shot of the CoronaVac COVID-19 vaccine at the Salvador Sanfuentes public school during the start of the vaccination campaign for educators, in Santiago, Chile. A real-world study of millions of Chileans who had received the Chinese-developed CoronaVac vaccine has found it 67% effective against symptoms and 80% against death from COVID-19, the South American country's Health Ministry said Friday, April 16, 2021. (AP Photo/Esteban Felix, File)
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