Inclusion Criteria:  Received at least 1 dose of treatment with REGN5459 or REGN5458 in study R5459-RT-1944 Received, or scheduled to receive after acceptable crossmatching, a kidney transplant while enrolled in study R5459-RT-1944 Willing and able to comply with clinic visits and study-related procedures Provide informed consent signed by study patient or legally acceptable representative  Exclusion Criteria:  There are no exclusion criteria for this study.  Note: Other protocol defined Inclusion/Exclusion criteria may apply