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IgG anti-S antibody response after natural infection (“infection”, green) and after vaccination in previously infected HCW (“hybrid immunity”, blue) and naive HCW (“vaccination”, red). In addition, the results at 10 months of HCW who have received a booster dose before the 10-month time point are shown in yellow (excluded for statistical analysis). Median time after booster (shown as time point "B") was 21 days (IQR: 13.8-39.5 days).
