Association Between Low Anti-spike Antibody Levels After the Third Dose of SARS-CoV-2 Vaccination and Hospitalization due to Symptomatic Breakthrough Infection in Kidney Transplant Recipients.

"CONFLICTS OF INTEREST: None declared."

"RESEARCH FUNDING The study was funded by an SNUH study fund (grant No. 3020210250; supported by generous donations from Hakcheon Woo, Ok-Cheon Seo, Whando Ra, Myunghyun Park, and GSI Co., Korea) and investigator-initiated grants from Abbott Diagnostics. The companies had no role in the design of this study; data collection, analyses, and interpretation; the writing of the manuscript; or the decision to publish the results."

"This was a noninterventional prospective study that examined the efficacy of a third dose of COVID-19 vaccination in KTRs. The study has been registered at clinicaltrials.gov (NCT05156086). All participants provided written consent, and the study was approved by the Institutional Review Board of the Seoul National University Hospital (IRB number: H-2110-175-1266)."