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.