All coverage
Pfizer Scaled Back 2020 COVID-19 Vaccine Production Targets From 100 Million to 50 Million Doses
By Robert Langreth
More Than 12.7 Billion Shots Given: Covid-19 Tracker
By Janice Kew, Michelle Cortez & Torrey Clark
'Absolutely normal': Covid vaccine side effects are no reason to avoid the shots, doctors say
By Allyson Chiu
COVID-19 vaccine distribution's 'last mile' poses huge challenges
By Tina Hesman Saey
The UK has approved a COVID vaccine — here's what scientists now want to know
By Heidi Ledford, David Cyranoski & Richard Van Noorden