Moderna to Seek Authorization of Its Coronavirus Vaccine for Young Children March 23, 2022 Auto Bot BioNTech SE, Centers for Disease Control and Prevention, Clinical Trials, Coronavirus (2019-nCoV), Food and Drug Administration, Pfizer Inc, Vaccination and Immunization 0 The company said the vaccine produced a strong immune response in children younger than 6, but proved only about 40 percent effective in preventing symptomatic Covid-19.