First grader Rihanna Chihuaque, 7, receives a COVID-19 vaccine at Arturo Velasquez Institute in Chicago last November. Scott Olson/Getty Images hide caption
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children COVID vaccine
Pfizer-BioNTech's COVID-19 vaccine for young children is a lower-dose formulation of the companies' adult vaccine. It was found to be safe and nearly 91% effective at preventing COVID-19. Paul Hennessy/SOPA Images/LightRocket via Getty hide caption