A three-dose Covid-19 vaccine appears safe and produces strong immune response in children ages 6 months to 5 years, Pfizer says
The quest for longer-lasting Covid-19 vaccinesThe Phase 2/3 trial included 1,678 children who received a third dose during the period when the Omicron coronavirus variant dominated. Antibody levels tested one month after the third dose showed the vaccine produced a similar immune response as two doses in 16-to-25 year-olds, the companies said in a news release. The data has not yet been peer-reviewed or published.Midtrial results found vaccine efficacy of 80.
In February, the US Food and Drug Administration asked the companies to submit a request for emergency use authorization based on the two-dose data, but then postponed a meeting of the agency's vaccine advisory board so the third-dose data could be considered.
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