Response to three doses of the Pfizer/BioNTech BNT162b2 COVID-19 vaccine: a retrospective study of a cohort of haemodialysis patients in France

Table 3 Anti–spike 1 immunoglobulin G titres in COVID-19-negative patients, by the number of vaccine injections

Number of patients	0 injection	1 injection	2 injections	3 injections
Ser₁	18	3	105	0
Ser₂	11	6	7	96
Total	29	9	112	96
Mean (SD) anti-S1 Ig titre (U/ml)	0 (0)	0.11 (0.34)	19.5 (34.4)	170.06 (212.12)
Median [IQR] anti-S1 Ig titre (U/ml)	0 [0; 0]	0 [0; 0]	7.09 [2.21; 19.94]	93.26 [34.25; 176.06]

Ser₁ First serology assay, Ser₂ Second serology assay, SD Standard deviation, IQR Interquartile range, anti-S1 Ig Anti–spike 1 immunoglobulin G

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