Pfizer and BioNTech launch trial of Omicron – targeted COVID vaccine
Pfizer Inc and BioNTechSE said on Tuesday they started a clinical trial to test a new version of
Pfizer-BioNTech testing booster of their COVID-19 vaccine in new trial
Pfizer and BioNTech say they are testing a third dose of their COVID-19 vaccine to better understand
FACTBOX: Latest on worldwide spread of the coronavirus
Several countries welcomed 2021 amid stringent coronavirus restrictions as the world looked to move