In this clinical, prospective, non-interventional study to assess the effectiveness of an additional dose of COVID-19 vaccination, we evaluated the seroconversion rate of KTRs after the booster shot. Consecutive individuals who have completed standard two-doses of COVID-19 vaccination were enrolled. Following consent, demographic and clinical data were collected from participants, including patient/ transplant characteristics and information regarding previous COVID-19 vaccination.~1 Study visit and sample collection Patients were invited to return for up to 2 follow-up visits for sample collection. Whole blood samples were collected two weeks to 1 day before the booster vaccination and 4 weeks after. During the visit for the second blood sample, a survey was conducted to assess booster-related adverse events.~2. Anti-SARS-CoV-2 antibody assay IgG antibodies against the receptor-binding domain (RBD) of the S1 subunit of the spike protein of severe acute respiratory syndrome coronavirus 2(SARS-CoV-2) were quantified with SARS-CoV-2 IgG II Quant assay (Abbott).~Additionally, neutralizing antibody was assessed using anti-SARS-CoV-2 GenScript cPass SARS-CoV-2 Neutralization Antibody Detection Kit. The cPass detection kit utilizes the horseradish peroxidase (HRP) conjugated recombinant SARS-CoV-2 RBD protein and the human angiotensin-converting enzyme 2 (ACE2) receptor protein. It detects neutralizing antibodies capable of blocking protein interaction between HRP-RBD and ACE2. The assay was performed according to the manufacturer's instructions.
The current study is a noninterventional prospective study examining the efficacy of additional dosage of the coronavirus disease 2019 (COVID-19) vaccine in kidney transplant recipients (KTRs).