Maria Castrejon, 71, grimaces as she is vaccinated with a second dose of the Sinovac COVID-19 vaccine at the Americas Cultural Center, in Ecatepec, Mexico, Saturday, April 3, 2021. (AP Photo/Ginnette Riquelme)
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Maria Castrejon, 71, grimaces as she is vaccinated with a second dose of the Sinovac COVID-19 vaccine at the Americas Cultural Center, in Ecatepec, Mexico, Saturday, April 3, 2021. (AP Photo/Ginnette Riquelme)
