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CUENCA, ECUADOR - APRIL 19: A health worker prepares a dose of the Sinovac vaccine as part of the vaccination campaign on April 19, 2021 in Cuenca, Ecuador. (Photo by Xavier Caivinagua/Agencia Press South/Getty Images)
CUENCA, ECUADOR - APRIL 19: A health worker prepares a dose of the Sinovac vaccine as part of the vaccination campaign on April 19, 2021 in Cuenca, Ecuador. (Photo by Xavier Caivinagua/Agencia Press South/Getty Images)
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