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 ...
(Reuters) -Germany's BioNTech, Pfizer's partner in COVID-19 vaccines, said the two companies would start tests on humans of next-generation shots that protect against a wide variety of coronaviruses ...
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