CD40LG and COVID-19: With the published guidelines of the Novel Coronavirus Pneumonia Diagnosis and Treatment Program (Trial Version 7),5 the suspected cases are positive for serum SARS-CoV-2-specific IgM/IgG antibodies, are positive for SARS-CoV-2-specific IgG antibodies, or have SARS-CoV-2 IgG antibody concentrations that are four times greater in the recovery period than in the acute period, which can confirm the diagnosis of COVID-19.12,13 The diagnosis standard of COVID-19 is a changing situation.