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Normalized serology assay results for 15 SARS-CoV-2 RT-PCR–positive hospitalized patients with serial samples. Results were normalized to the positivity threshold (EUROIMMUN 1.1, DiaSorin 15 AU/mL) and limited to a maximum value of 10. Positivity corresponds to values ≥1.0, denoted by dotted lines. The colors of individual patients are the same across DiaSorin (A), EUROIMMUN (B), Roche (C), and Siemens (D) assays.
