Clinical trials have proven that the vaccine is over 90% effective against illness from COVID-19 in children ages 5-11. Kids ages 5-11 develop similar virus-fighting antibody levels as older kids, teens and young adults. Previous trial data and existing evidence show that the vaccine is up to 95% effective in older kids and teens.

According to the data provided by Pfizer to the FDA’s advisory committee, the vaccine trial included 1,518 children who received the COVID vaccine and 750 who did not receive the vaccine. The vaccine was 90.7 percent effective in preventing symptomatic COVID disease. There were 16 infections among kids who did not get the vaccine and 3 infections in the vaccinated group. Infections in the unvaccinated group were more severe, while infections in the vaccinated group were all mild.