Pfizer Says its COVID-19 Vaccine is Safe and Likely to Work In Younger Children, and it’s Planning to Ask for Permission to Use it In Kids as Young as 5 Posted byAndrew Dunn September 20, 2021 Leave a comment on Pfizer Says its COVID-19 Vaccine is Safe and Likely to Work In Younger Children, and it’s Planning to Ask for Permission to Use it In Kids as Young as 5 The pharmaceutical giant plans to soon apply for an expanded OK that includes 5- to 11-year-olds.