
Pfizer and BioNTech, which produced the first COVID-19 vaccine authorized in the U.S., say they will expand ongoing trials to include a third dose for children as young as 6 months old.
(Image credit: Nam Y. Huh/AP)

Pfizer and BioNTech, which produced the first COVID-19 vaccine authorized in the U.S., say they will expand ongoing trials to include a third dose for children as young as 6 months old.
(Image credit: Nam Y. Huh/AP)
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