Pfizer asks FDA to approve emergency use of its COVID-19 vaccine

Pfizer formally asked U.S. regulators Friday to allow emergency use of its COVID-19 vaccine, starting the clock on a process that could bring limited first shots as early as next month and eventually an end to the pandemic — but not until after a long, hard winter.

The action comes days after Pfizer Inc. and its German partner BioNTech announced that its...