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FDA Advisers Say Next Round of COVID Booster Shots Should  Target an XBB Variant

June 15, 2023


An advisory panel to the U.S. Food and Drug Administration voted unanimously on Thursday to recommend that COVID booster shots be updated for the fall to protect solely against one of the three XBB variants that have taken hold in the United States.

Those three XBB variants, which are all sublineages of the Omicron variant, are XBB.1.5, XBB.1.16 and XBB.2.3, CNN reported. What will be dropped from the updated vaccines will be protection against the original strain of the virus because experts believe it could contribute to lower vaccine efficacy against newer strains.