Pfizer Inc. and BioNTech said on Thursday they had asked U.S. regulators to approve emergency use of their COVID-19 vaccine for children aged from five to 11, Pfizer said in a post on Twitter.“We and @BioNTech_Group officially submitted our request to @US_FDA for Emergency Use Authorization (EUA) of our #COVID19 vaccine in children 5 to <12,” the company said.“We’re committed to working with the FDA with the ultimate goal of helping protect children against this serious public health threat.”UPDATE: We and @BioNTech_Group officially submitted our request to @US_FDA for Emergency Use Authorization (EUA) of our #COVID19 vaccine in children 5 to <12.