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The time-series behavior of IgG in sera from patients with COVID-19 by immunochromatographic test (INNOVITA, Hebei, China). “+” or “−“ indicates positive or negative IgG for SARS-CoV-2 at each time point. The symptom onset date was reported from each patient. Abbreviations: COVID-19, coronavirus disease 2019; IgG, immunoglobulin G; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2.
