Pfizer-BioNTech COVID shot 73.2% effective in kids under 5
Pfizer and BioNTech's vaccine was authorized for children under 5 years of age in June, based on data that showed the vaccine generated a similar immune response to those seen in older age groups. An early analysis based on 10 symptomatic COVID-19 cases in the study had suggested a vaccine efficacy of 80.3% in this group.