CD40LG and COVID-19: In this study, our objective was to quantify directly the association of the results of four lateral flow antibody tests (Rapid Test Consortium's AbC-19 rapid test, OrientGene COVID IgG/IgM rapid test cassette, SureScreen COVID-19 rapid test cassette, and Biomerica COVID-19 IgG/IgM rapid test) and two laboratory-based immunoassays (Roche Elecsys and Euroimmun Anti-SARS-CoV-2 enzyme-linked immunosorbent assay [ELISA]), with subsequent symptom-driven PCR test positivity.