<p style="text-align:start;" size="1" _root="[object Object]" __ownerid="undefined" __hash="undefined" __altered="false">Pfizer and BioNTech have asked the European Medicines Agency to extend the use of its Covid-19 vaccine to cover adolescents aged 12 to 15 after trial data showed it worked well and was safe in this group, the companies announced Friday, marking a significant step in expanding access to the shot where most available products are only licensed for use in adults.</p>
