News Pfizer-BioNTech say low dose of its COVID-19 vaccine is safe and effective for kids 5-11 September 20, 2021Karen Weintraub, USA TODAYComments Off on Pfizer-BioNTech say low dose of its COVID-19 vaccine is safe and effective for kids 5-11 Pfizer-BioNTech's COVID-19 vaccine is safe and effective for children agesĀ 5 to 11 at one-third the dose used in adolescents and adults.