COVID-19 Vaccine Effectiveness Estimated to Turn Negative Over Time in Children: Study
By Zachary Stieber September 14, 2022 Updated: September 14, 2022 The effectiveness of Pfizer’s COVID-19 vaccine against infection turned negative over time for children aged 5 to 11, according to a new study. Researchers found that for kids in the age group, the effectiveness peaked at 60 percent to 70 percent several weeks after the first dose. It … Read more