Fig. 2.

Longitudinal assessment with viral RNA and serological antibodies testing for four COVID-19 patients. Shown is the variation of presence of viral RNA and antibodies against SARS-CoV-2 in four confirmed COVID-19 patients: male, 59 year-old (Patient 1; A), female, 75 year-old (Patient 2; B), female, 39 year-old (Patient 3; C), and female, 22 year-old (Patient 4; D). The results of Elecsys Assay are presented as COI values (purple), and the results of ELISA assay are presented as OD values (IgG: dark blue; IgM: light blue) measured by 450 nm. Results of the qualitative viral RNA testing, Elecsys Assay and ELISA assay are amended as positive (red), weakly positive (pink), negative (green), and n/a (white). The dash lines denote the cut-off value for ELISA IgG assay (dark blue, 0•134), ELISA IgM assay (light blue, 0•168), and Elecsys Assay (purple, 1•00).