Pfizer Inc and BioNTech SE said on Wednesday their Covid-19 vaccine was safe and effective and produced robust antibody responses in 12- to 15-year-olds, paving the way for them to seek US emergency use authorisation in weeks.

Pfizer hopes that vaccinations of the group could begin before the next school year, Albert Bourla, Pfizer's chairperson and chief executive, said in a statement...