Transplant(148) recipient(116) SARS-CoV-2(107) response(67) COVID-19(62) Solid(58) Patient(43) mRNA(40) acute respiratory syndrome(33) Vaccine(33) dose(31) coronavirus(29) coronavirus disease(28) Infection(26) antibody(25) Antibody Response(25) vaccination(25) Cohort(24) BNT162b2(24) median(22) analyzed(21) vaccine dose(21) IgG(21) humoral(19) Humoral response(19) Immunoglobulin(18) significantly lower(18) recipients(18) mRNA vaccine(18) 95% confidence interval(17)