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Comparison of plasma markers of systemic complement activation (C3a, C5a, sc5b-9). (A) shows results for normal donors (ND) (n=20), and patients with positive (+) or negative (-) COVID-19 PCR test results. (B) further stratifies results based on low (<1.0 ug/ml FEU) or high (>1.0 ug/ml FEU) D-dimer concentration. Numerical results are summarized in (C).
