Pfizer says tweaking its COVID-19 vaccine to better target the omicron variant is safe and boosts protection.
Pfizer and its partner BioNTech studied two different ways of updating their shots -- targeting just omicron, or a combination booster that adds omicron protection to the original vaccine. They also tested whether to keep today’s standard dosage -- 30 micrograms -- or to double the shots’ strength.
“Based on these data, we believe we have two very strong omicron-adapted candidates,” Pfizer CEO Albert Bourla said in a statement.But many experts say combination shots may be the best approach because they would retain the proven benefits of the original COVID-19 vaccine while adding new protection against omicron. And Pfizer said a month after people received its combo shot, they had a 9 to 11-fold increase in omicron-fighting antibodies. That’s more than 1.
Moderna recently announced similar results from tests of its combination shot, what scientists call a “bivalent” vaccine.
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