CD40LG and COVID-19: The diagnosis of COVID-19 was established by real-time polymerase chain reaction (RT-PCR) in 27, anti-SARS-CoV-2 IgG and/or IgM antibodies in 9, both RT-PCR and anti-SARS-CoV-2 antibodies in 6, CT findings in 2, in 1 case by clinical findings and epidemiological background, and in 1 patient this information was not available.