Pfizer study tests extra covid-19 vaccine dose for kids under 5 in setback
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Pfizer said on Friday it was changing plans and testing three doses of its Covid-19 vaccine in babies and preschoolers after the..
Watch VideoThe U.S. is expanding COVID-19 boosters, ruling that 16- and 17-year-olds can get a third dose of Pfizer's..
Watch VideoPfizer said Wednesday that a booster of its COVID-19 vaccine may offer important protection against the new Omicron..