CD52 and tetanus: Suppression of T-cell responses to antigen (tetanus) by multiple different seminal fluid samples was not observed in the presence of an antibody (CF1D12) against the bioactive terminal glycan of CD52 (13) or after immunodepletion of CD52 from seminal fluid with alemtuzumab, a humanized monoclonal antibody against the C-terminus-GPI junction of CD52 (13).