Three-Dose Covid-19 Vaccine Produces Strong Immune Responses In Children Ages Six Months To Five Years, Pfizer And BioNTech SayThree Child-size doses of the Pfizer/BioNtech Covid-19 vaccine have shown a strong immune response in children ages six months to five years, the companies said Monday. The vaccine makers said they will finish submitting the trial data to the US Food and Drug Administration this week.
