Figure 1.
(A) Evolution of the anti-S1 antibody levels over time measured by Elisa test. Antibody levels are expressed as median levels with IQR. Patients with documented COVID-19 infection have been removed (11 patients). (B) Probability of maintaining immunity over time after the first vaccine injection using the Kaplan-Meier method. The 15 patients who acquired post-vaccination immunity during the first three months after vaccination are included in this analysis. (C) Kinetics of humoral response after the first vaccination with Spearman-type linear regression (R2 = 0.22; p < 0.0001).