Secondary immune response to an antigen is highly intensified due to the

Secondary immune response to an antigen is highly intensified due to the clonal expansion of memory B cells and T cells generated during the primary response. Moreover, memory cells have an increased affinity for the antigen. The antibody titer (concentration) is much higher during the secondary immune response. Immunoglobulins (antibodies) produced during primary response are short-lived and are not responsible for the heightened secondary immune response.