FILE - Pharmacist Sima Manifar prepares a children's dose of the Pfizer COVID-19 vaccine during a vaccination clinic at City of Lawrence's "The Center," which serves seniors, families and the community, Wednesday, Dec. 29, 2021, in Lawrence, Mass. 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, Jan. 25, 2022.
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. The new U.S. study is enrolling up to 1,420 healthy adults, ages 18 to 55, to test the updated omicron-based shots for use as a booster or for primary vaccinations. Researchers will examine the tweaked vaccine’s safety and how it revs up the immune system in comparison to the original shots.
Pfizer’s CEO told CNBC earlier this month that the company could have some omicron-matched doses ready as early as March. But doing what the company calls “at-risk” manufacturing doesn’t mean those doses will be rolled out to the public. Pfizer and other vaccine makers also have brewed and tested experimental doses to match previous variants, changes that ultimately weren’t needed but offered valuable practice at tweaking the recipe.
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