Moderna starts trial for Omicron-specific booster shot
By Devika Syamnath, Sherry Jacob-Phillips & Amruta Khandekar
Pfizer and BioNTech start trials of new Omicron-specific jab
By Philippa Roxby
As Pfizer and BioNTech begin clinical trial of Omicron-based vaccine, timeline to authorization is unclear
By Matthew Herper
Pfizer and BioNTech launch trial of Omicron-targeted COVID vaccine
By Michael Erman & Ludwig Burger