Vaccine manufacturers Pfizer, Moderna and Novavax will be expected to update their shots according to the strain the FDA selects for the fall.
are already developing versions of their respective vaccines targeting XBB.1.5 and other circulating variants.
The upcoming strain selection will be crucial to those companies' abilities to compete in the fall, when the U.S. is expected to shift vaccine distribution to the private sector. That means all three companies will start selling their updated Covid shots directly to health-care providers.that Covid booster shots target XBB variants.Those strains accounted for more thanThey noted that the proportion of XBB.1.5 cases is declining, but both XBB.1.16 and XBB.2.3 are "on the rise.
Last year's Covid boosters were bivalent, meaning they targeted the original strain of the virus and omicron variants BA.4 and BA.5. Those variants dominated cases nationwide last fall and winter.
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