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Pfizer starting study of vaccine geared toward Omicron variant
CBSN
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 makers have been updating their shots to better match Omicron in case global health authorities decide the change is needed.