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(a–d) Plasma neutralization titers against Delta (a,c) and Omicron (b,d) in dialysis patients (n = 34) and controls (n = 12) who received booster doses of the mRNA vaccine showing results for plasma neutralization titers measured before and 2–3 weeks after the first booster dose. (e) Neutralizing antibodies in dialysis patients only against Delta or Omicron. The graph represents mean ± SD. * p < 0.05; ** p < 0.01; *** p < 0.001; **** p < 0.0001.
