*2.1. Study Inclusion*

At the onset of the pandemic, we sought to build and populate a registry of all transplant recipients who contracted the disease, after obtaining Institutional Review Board exemption [8]. The study included all consecutive adult solid-organ-transplant recipients 18 years of age or above who had previously received a solid-organ transplant in our institution (liver, kidney or both) and tested positive for SARS-CoV-2 between 1 February 2020 and 18 February 2021. Subjects were included regardless of the elapsed time between transplantation and the positive SARS-CoV-2 test. All patients had functioning grafts at the time of enrollment. A positive SARS-CoV-2 diagnosis was determined via either a positive polymerase chain reaction or a positive antigen test [9]. The subjects were either completely unvaccinated or less than 2 weeks from their last vaccination.
