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Comparison of SARS-CoV-2 nucleocapsid antigen concentration in plasma, diagnostic respiratory swab Ct, and disease severity in 74 plasma samples drawn within ±1 day of diagnostic respiratory RT-qPCR. The dashed line represents the positivity threshold. Statistical significance from 2-sided Wilcoxon rank sum testing is denoted as ns: P > 0.05, *: P ≤ 0.05, **: P ≤ 0.01, ***: P ≤ 0.001, ****: P ≤ 0.0001.
