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Changes in the anti-S IgG titers. Changes in the natural logarithmic form of the anti-S IgG titers are shown. Dots and error bars show mean ± 95% confidential interval of log-transformed anti-S IgG titers in the HD group (circular dots) and in the control HCW group (triangular dots). HD group versus HCW group via Welch’s t-test. ∗∗∗P < 0.001. HD, hemodialysis; HCW, health care worker.
