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Correlation of the PRNT50 titers and the time (in days) between first positive PCR and serum sampling of the included patients (n = 63). PRNT50, 50% plaque-reduction neutralization test. Method described in Materials and Methods. PRNT50 values of <20 were considered negative and plotted as 6 for drawing the logarithmic correlation line. A PRNT50 value of ≥4,860 was plotted as 4,860 for drawing the logarithmic correlation line.
