CD40LG and COVID-19: All GBS cases were diagnosed according to clinical findings and the Brighton Collaboration GBS Working group criteria [7], and a diagnosis of COVID-19 was defined as a positive SARS-CoV-2 real-time reverse transcriptase PCR (RT-PCR) assay result on a nasopharyngeal swab or a positive serological testing (IgM or IgG) in a little fraction of patients.