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Traditional influenza vaccines target the variable hemagglutinin (HA) protein, necessitating annual vaccine updates, while the slower-evolving neuraminidase (NA) presents a promising target for broader protection. We investigated the breadth of anti-NA B cell responses to seasonal influenza vaccination in humans. We screened plasmablast-derived monoclonal antibodies (mAbs) from three donors, identifying 11 clonally distinct NA mAbs from 268 vaccine-specific mAbs. Among these, mAb-297 showed exceptionally broad NA inhibition, effectively protecting mice against lethal doses of influenza A and B viruses, including H5N1. We show that mAb-297 targets a common binding motif in the conserved NA active site. 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