The blood tests included thyroid function, hemoglobin A1C (HbA1c), homocysteine, copper level, ceruloplasmin, rheumatologic factors (IgG, IgM, IgA, RF, ANA, ENA), cryoglobulin, RPR (rapid plasma reagin), hepatitis antigen/antibody (HBsAg and anti-HCV) and antiphospholipid antibody (anti-beta 2 GPI-IgG, cardiolipin-IgG, and cardiolipin-IgM). Here, CD40LG is linked to hepatitis A virus infection.