CD40LG and COVID-19: As preventative measures, 132 (37.1%) participants underwent nasopharyngeal swab, 113 (31.8%) were advised to start quarantine only in case of appearance of COVID-19-related symptoms, 40 (11.2%) were asked to start precautionary home isolation regardless of the presence of symptoms and 24 (6.7%) underwent serological analyses for the presence of SARS-CoV-2 IgG/IgM.