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A baby receives a vaccine at a maternal and child health care hospital in Handan City, north China's Hebei Province, April 25, 2019. Thursday marks the children's vaccination day in China. (Xinhua/Hao Qunying)
A baby receives a vaccine at a maternal and child health care hospital in Handan City, north China's Hebei Province, April 25, 2019. Thursday marks the children's vaccination day in China. (Xinhua/Hao Qunying)