Abstract
Background and objectives
Highly effective vaccines against severe acute respiratory syndrome virus 2 have been developed and administered worldwide. However, protection from coronavirus disease 2019 is not absolute and an optimal vaccination regimen needs to be established. This study assessed the clinical efficacy of the coronavirus disease 2019 vaccine among dialysis patients receiving 3 or 4 doses of vaccine.
Design, setting, participants, and measurements
This retrospective study was conducted using the electronic database of Clalit Health Maintenance Organization in Israel. Chronic dialysis patients treated with either hemodialysis or peritoneal dialysis during the coronavirus disease 2019 pandemic were included. We compared clinical outcomes of patients who had received three or four doses of the severe acute respiratory syndrome virus 2 vaccine.
Results
This study included 1,030 patients on chronic dialysis, with a mean age of 68 ± 13 years. Among them, 502 patients had received 3 doses of the vaccine and 528 received 4 doses. Severe acute respiratory syndrome virus 2 infection rates, severe COVID-19 that resulted in hospitalizations, COVID-19–related mortality and all-cause mortality rates were lower among chronic dialysis patients who received a fourth dose of vaccine as compared to those who received only 3 doses (after controlling for age, sex and comorbidities). Despite lower mortality rates observed with the Omicron variant, the fourth dose was significantly associated with reduced COVID-19-related mortality (1.7% vs. 3.8%, p = 0.04). Odds ratio for COVID-19-related mortality was 0.44 with 95% CI 0.2–0.98.
Conclusions
As seen in the general population and with previous vaccine boosters, the fourth dose of the BNT162b2 vaccine reduced rates of severe COVID-19-related hospitalization and mortality among chronic dialysis patients. Further studies are needed to establish the optimal regimens of vaccination for patients on chronic dialysis.
Graphical abstract
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Data availability
Data access requests can be adressed to the corresponding author.
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Acknowledgements
We thank Faye Schreiber, MS for editing the manuscript. She is an employee of Meir Medical Center.
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Research area and study design: KC-H, TH-L, SB, MS; Data acquisition: NN, SB, KC-H; Data analysis and interpretation: KC-H, TH-L, YE, AG, SB, KC-H; Statistical analysis: KC-H, TH-L; Supervision or mentorship: OW, SB, KC-H, MS. Each author contributed important intellectual content during manuscript drafting or revision and agrees to be personally accountable for the individual’s own contributions.
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The study was approved by the Ethics Committee and Institutional Review Board of Meir Medical Center (MMC 220–21). The committee waived the requirement for informed consent due to the retrospective nature of the study. The study was performed in accordance with the Declaration of Helsinki and Good Clinical Practice guidelines.
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Cohen-Hagai, K., Hornik-Lurie, T., Benchetrit, S. et al. Clinical efficacy of the fourth dose of the BNT162b2 vaccine in maintenance dialysis patients . J Nephrol 36, 1957–1964 (2023). https://doi.org/10.1007/s40620-023-01667-z
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DOI: https://doi.org/10.1007/s40620-023-01667-z