Several lateral flow assays for COVID-19 IgG and IgM antibodies have been FDA EUA approved, including qSARS-CoV-2 IgG/IgM Rapid Test developed by Cellex which targets the S and N proteins and gives qualitative results within 15–20 min with 93.8% positive percent agreement (PPA) and 96% negative percent agreement (NPA) (FDA, 2020c; Mathur and Mathur, 2020). Here, CD40LG is linked to COVID-19.