CD40LG and Lyme disease: Serological tests for Lyme disease confirmed the diagnosis of chronic borreliosis: the enzyme-linked immunosorbent assay was positive for IgG (titer > 200 U/mL, normal value < 6) and IgM (Enzygnost® Lyme link VLsE/IgG and Borreliosis/IgM used on the BEPIII® system, Siemens Healthcare Diagnostic Products GmbH, Marburg, Germany), and was confirmed by immunoblotting.