The Food and Drug Administration said Thursday it had advised drugmakers to update the Covid vaccines to target the KP.2 strain, a descendant of the highly contagious JN.1 variant that began circulating widely in the U.S. this winter.
The announcement came just over a week after an FDA advisory panel voted unanimously to recommend that the Covid vaccines for the fall be updated to target the JN.1 variant or one of its descendants.
Following the vote, there was a disagreement between panel members and Dr. Peter Marks, the agency’s top vaccine regulator, about which strain the agency should choose. Most panel members expressed a preference for JN.1, while Marks preferred selecting a newer strain, such as KP.2.