Covid-19: Pfizer opens study of vaccine updated to match Omicron strain
COVID-19 vaccine makers have been updating their shots to better match omicron in case global health authorities decide the change is needed. Pfizer has begun a study comparing its original COVID-19 vaccine with doses specially tweaked to match the hugely contagious omicron variant. Pfizer and its partner BioNTech announced the study on Tuesday. COVID-19 vaccine … Read more