CD40LG and COVID-19: Tan et al. reported that IgM can be detected in patient samples at 7 days PSO in only 10.3% of patients [24], Tuaillon et al. revealed that samples collected during the first six days of COVID-19 symptoms were rarely reported using six commercial point-of-care tests [20], and Yang et al. concluded that values were lower than 15% using cyclic enhanced fluorescence assay [25].