CD40LG and COVID-19: However, we believe that our results are comparable with results presented in other studies, especially considering the fact that we have only included participants within a minimum three weeks after the peaks of epidemic or during an inter-epidemic period (endemic phase) of COVID-19 in Vojvodina when a diagnostic sensitivity of serological test (both IgM and IgG) has already reached a satisfactory level [6, 13, 15, 16].