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ROC curve analysis of anti-RBD-S1 IgG titers on DCB. AUC relative value: 0.76 (95% CI 0.63–0.89), p = 0.001. ROC receiver operating characteristic, RBD-S1 receptor-binding domain of the SARS-CoV-2 Spike protein, DCB durable clinical benefit, AUC area under the curve, CI confidence interval
