Prevalence and Predictors of SARS-CoV-2 Antibodies among Solid Organ Transplant Recipients with Confirmed Infection.

It remains uncertain whether immunocompromised patients including solid organ transplant (SOT) recipients will have a robust antibody response to SARS-CoV-2 infection. We enrolled all adult SOT recipients at our center with confirmed SARS-CoV-2 infection who underwent antibody testing with a single commercially available anti-nucleocapsid antibody test at least 7 days after diagnosis in a retrospective cohort. 70 SOT recipients were studied (56% kidney, 19% lung, 14% liver +/- kidney, and 11% heart +/- kidney recipients). 36 (51%) had positive anti-nucleocapsid antibody testing, and 34 (49%) were negative. Recipients of a kidney allograft were less likely to have positive antibody testing compared those who did not receive a kidney (p=0.04). In the final multivariable model, the years from transplant to diagnosis (OR 1.26, p=0.002) and baseline immunosuppression with more than 2 agents (OR 0.26, p=0.03) were significantly associated with the antibody test result, controlling for kidney transplantation. In conclusion, among SOT recipients with confirmed infection, only 51 % of patients had detectable anti-nucleocapsid antibodies, and transplant-related variables including the level and nature of immunosuppression are important predictors. These findings raise the concern that SOT recipients with COVID-19 may be less likely to form SARS-CoV-2 antibodies.