That strain accounted for nearly 40% of all Covid cases in the U.S. in early June, but that proportion is slowly declining, according toBut facing pressure to deliver new shots by the fall, Pfizer, Moderna and Novavax began development on versions of their vaccines targeting XBB.1.5 months before the FDA's decision. Preliminary data those companies presented last week indicates that their jabs produce strong immune responses against all XBB variants.
Pfizer said Thursday it will be able to deliver a shot targeting XBB.1.5 by July. Moderna and Novavax did not provide specific timelines for their versions.
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