Yiseli Dominguez, a medical assistant, administers a flu vaccine to a patient at the Esperanza Health Centers Brighton Park North Clinic in Chicago. This story appeared in Today, Explained, a daily newsletter that helps you understand the most compelling news and stories of the day. Subscribe here. In two weeks, I’ll bundle my daughter into her snowsuit and trek over to the pediatrician’s office, where a harried nurse in cartoon-print scrubs will stick my wailing child with her second flu shot. For years, the Centers for Disease Control and Prevention has recommended that all kids ol...

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