Elena Rosales, 3, receives a second injection in her leg from nurse Lela Lartey, left, with her mother, Mariaelena Lozano, right, on Dec. 7, 2021, while participating in the Moderna COVID-19 vaccine trial at Lurie Children’s Hospital. (Brian Cassella / Chicago Tribune)
Inside a Chicago COVID-19 vaccine trial for babies, toddlers: ‘It will help all of the littles get their shots.’

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