Introduction
A third dose of SARS-CoV-2 mRNA vaccine has been administered in several countries.1,2 Patients with end-stage kidney disease have a weak immune response to 2-sessional doses of the mRNA vaccine.3, 4, 5, 6, 7 Because patients undergoing hemodialysis (HD) are at a high risk for COVID-19 severity and death, they have been prioritized in vaccination programs worldwide.8,9