Pfizer Vaccine 100% Effective In Adolescents After 4 Months SHAFIQ November 23, 2021 Comment ----YOU ADS--- Get Link ----YOU ADS--- Pfizer and BioNTech said Monday their COVID-19 vaccine remained 100 percent effective in children 12 to 15 years old, four months after the second dose. ----YOU ADS--- Go to Link ----YOU ADS--- Share with your friends