vaccination(32) recipient(32) COVID-19(25) dose(24) Patient(24) Antibody Response(20) BNT162b2(19) SARS-CoV-2(19) Immunosuppression(16) recipients(16) Heart transplantation(16) IgG(15) COVID-19 vaccine(15) detectable(15) BNT162b2 vaccine(14) Omicron variant(14) investigated(14) domain(13) Humoral response(13) Vaccine(12) immune response(12) lung transplantation(11) second dose(11) solid organ transplant(10) Neutralizing antibodies(10) antibody(10) RBD(10) the antibody response(10) Anti-RBD antibody(10) paucity of data(9)