Pfizer's COVID-19 vaccine was 73% effective in protecting children younger than 5 as omicron spread in the spring, the company announced Tuesday.
Vaccinations for babies, toddlers and preschoolers opened in the U.S. in June after months of delay. Only about 6% of youngsters ages 6 months through 4 years had gotten at least one dose of a COVID-19 vaccine by mid-August, according to the American Academy of Pediatrics.
