CD40LG and COVID-19: Of interest that, although RDT are considered only qualitative (positive/negative) tests, on the basis of previous studies [12], we created a three-level chromatographic intensity scale and found that the overall semi-quantitative concordance rate of antibodies between the LFA and CLIA was high both for IgM and for IgG and maintained as a function of time from the onset and severity of acute COVID-19.