FIG 3.

Correlation between the results of SARS-CoV-2 NP ELISA and PCR analysis according to the time gap from the confirmatory PCR-positive URT swab to collection of serum (A) or plasma (B). The 368 blood samples were collected from 160 COVID-19 inpatients within 5 weeks after their confirmatory PCR-positive URT swab (red circle), and 43 blood samples were collected from COVID-19 outpatients simultaneously with their PCR-positive URT swab (blue square). Each inpatient data point area is proportional to the number of blood samples contributing to the data point.