FIG 4.

Median [NP] declined exponentially over time for 368 blood samples collected from 160 COVID-19 inpatients within 5 weeks after their confirmatory PCR-positive URT swab (red circle). The median [NP] of blood samples collected at day 0 to 1 for 32 COVID-19 inpatients (1,045 pg/ml) was 36 times higher than the median [NP] (29 pg/ml) of blood samples collected from 43 COVID-19 outpatients simultaneously with their PCR-positive URT swab (blue square). For each inpatient data point, the time of blood sample collection is illustrated as mean ± SD number of days after the first PCR-positive URT swab. Each inpatient data point area is proportional to the number of blood samples contributing to the data point.