Kim et al. [37] reported that classical MBCs and activated MBCs specific for the tetanus toxoid C fragment, a component of the tetanus vaccine, co-expressed FcRL5 and CD11c (another marker expressed by atypical MBCs), while the frequency of FcRL5+CD11c+ cells among bulk classical MBCs and activated MBCs was very low. The gene discussed is FCRL5; the disease is tetanus.