Pfizer is enrolling healthy adults to test a reformulated Covid-19 vaccine that matches the hugely contagious Omicron variant, to see how it compares with the original shots.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.Omicron is more likely than previous variants to cause infection even in people who have been vaccinated, but it is not…
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