Fig. 2.

Quantity of virus and antibody by disease stage and symptom status. The top panel is a schematic of disease progression. Cycle number (CN) and signal-to-calibrator ratio (S/C) were averaged by disease stage to assess differences in CN or S/C by symptom status, using a Wilcoxon–Mann–Whitney test. The symptomatic group had lower mean CN versus the asymptomatic group during the contagious phase of disease. Antibody levels did not differ by symptom or disease stage. CN is inversely related to viral quantity, so the axis is reversed for clarity. ∗p < 0.001, + p 0.004.