Pfizer has begun a study comparing its original COVID-19 vaccine with doses specially tweaked to match the omicron variant.
COVID-19 vaccine-makers have been updating their shots to better match omicron in case global health authorities decide the change is needed.
The original vaccines still offer good protection against severe illness and death. Studies in the U.S. and elsewhere have made clear that adding a booster dose strengthens that protection and improves the chances of avoiding a milder infection. Full study results will take many months as volunteers receive multiple vaccine doses — and as researchers measure how long virus-fighting antibodies remain at high levels after an omicron-adapted dose versus the regular booster.
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