Korean J Transplant.  2023 Mar;37(1):49-56. 10.4285/kjt.22.0056.

Different antibody responses between liver and kidney transplant recipients elicited by third doses of COVID-19 mRNA vaccines

Affiliations
  • 1Department of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
  • 2Division of Hepatobiliary Surgery and Liver Transplantation, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
  • 3Department of Convergence Medicine, Asan Medical Institute of Convergence Science and Technology (AMIST), Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
  • 4Division of Kidney and Pancreas Transplantation, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea

Abstract

Background
Solid organ transplant recipients exhibit decreased antibody responses, mainly due to their weakened immune systems. However, data are limited on antibody responses after the primary series of coronavirus disease 2019 (COVID-19) vaccines among recipients of various solid organ transplant types. Thus, we compared the antibody responses after three COVID-19 vaccine doses between liver transplant (LT) and kidney transplant (KT) recipients.
Methods
We prospectively enrolled solid organ transplant recipients who received three COVID-19 vaccine doses from June 2021 to February 2022 and measured S1-specific immunoglobulin G antibodies using an enzyme-linked immunosorbent assay.
Results
Seventy-six LT and 17 KT recipients were included in the final analysis. KT recipients showed consistently lower antibody responses even after the third vaccine dose (86.2% vs. 52.9%, P=0.008) and lower antibody titers (median, 423.0 IU/mL [interquartile range, 99.6–2,057 IU/mL] vs. 19.7 IU/mL [interquartile range, 6.9–339.4 IU/mL]; P=0.006) than were observed in LT recipients. Mycophenolic acid was a significant risk factor for a seropositive antibody response after the third vaccine dose in the multivariable analysis (odds ratio, 0.06; 95% confidence interval, 0.00–0.39; P=0.02).
Conclusions
We found a weaker antibody response despite the completion of the primary series of COVID-19 vaccines in KT recipients than in LT recipients. Mycophenolic acid use in KT recipients might be the main contributor to this observation.

Keyword

SARS-CoV-2; COVID-19 vaccines; COVID-19 vaccine booster shot; Organ transplantation; Liver transplantation; Kidney transplantation

Figure

  • Fig. 1 Schematic diagram of the study participants.

  • Fig. 2 Antibody response 3 weeks after the second and third doses of coronavirus disease 2019 (COVID-19) vaccines. Thick horizontal lines indicate the median values. Seropositivity is presented as the percentage (%), calculated by the number of participants of seropositive antibody response (n) divided by the total participants (N). (A) Healthy volunteers and solid organ transplant recipients. (B) Liver transplant (LT) recipients with heterologous or homologous three-dose mRNA vaccination series and kidney transplant (KT) recipients with homologous three-dose mRNA vaccination series. SARS-CoV-2, severe acute respiratory syndrome coronavirus 2; IgG, immunoglobulin G.


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