Pfizer opens study of COVID shots updated to match omicron
By LAURAN NEERGAARD AP Medical Writer Pfizer has begun a study comparing its original COVID-19 vaccine with doses specially tweaked to match the omicron variant. Pfizer and its partner BioNTech announced the study on Tuesday. COVID-19 vaccine makers have been updating their shots in case global health authorities decide a change is needed. The Pfizer
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