Human protective monoclonal antibodies against the HA stem of group 2 HAs derived from an H3N2 virus-infected human

Of many human protective monoclonal antibodies against the HA stem, two human protective monoclonal antibodies were isolated in this study that predominantly recognize epitopes on the HA stem of group 2 and use unique IGHV3-66 and IGHV4-38-2 germline genes.