A health worker gives a shot of the Johnson & Johnson COVID-19 vaccine inside the Solidary Hands Shelter for the homeless in the poor neighborhood of Ceilandia in Brasilia, Brazil, June 29, 2021. Brazil's government started taking an online public survey on Dec. 24 to inform their decisions about whether and how to vaccinate children against the coronavirus. (AP Photo/Eraldo Peres, File)
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