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Anti-spike IgG antibody titers measured at 28 days after vaccination in 215 seronegative kidney transplant recipients (median titer, <6.8 arbitrary units [AUs]/ml [interquartile range, <6.8−<6.8 AUs/ml]) and 26 seropositive kidney transplant recipients (median titer, 224 AUs/ml [interquartile range, 76−496 AUs/ml]). The dotted line indicates the cutoff for positivity (50 AUs/ml).
