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RBD-specific serum IgG titers from visits two and three plotted against fold change in NP-specific IgG for visits three and four to determine if waning RBD-specific IgG was predictive of seroconversion for NP. Sensitivity, specificity, positive predictive value, and negative predictive value are shown for predicting an NP fold of greater than or equal to 4 at an IgG titer of less than 100,000.
