CD40LG and COVID-19: The importance of the diagnostic methods applied was further assessed by Rikhtegaran Tehrani et al. [36], which investigated 300 pre-epidemic samples and 100 qRT-PCR-confirmed COVID-19 samples using commercial tests such as EDITM Novel Coronavirus COVID-19 ELISA, Euroimmun Anti-SARS-CoV-2 ELISA and PP® COVID-19 IgM/IgG System.