JN.1-adapted vaccination is associated with readjustment of ancestral memory B cells toward neutralization within the JN.1 antigenic space
It is proposed that there is somatic hypermutation of existing B cell clones rather than de novo generation from naive B cells in JN.1-adapted booster vaccines and this finding indicates maturation of pre-existing, class-switched MBC rather than substantial de novo recruitment of naïve B cells.