CD40LG and leprosy: Serum samples from 91 volunteers, including patients with leprosy (n=62), household contacts (n=21), and endemic controls (n=8) were screened by enzyme-linked immunosorbent assays (ELISA) for IgA, IgM, and total IgG against four lipids-namely, cardiolipin (CL), phosphatidylcholine (PTC), phosphatidylethanolamine (PE), and phosphatidylinositol (PI)-and a glycosphingolipid-sulfatide (SL)-found in the bacterial cell wall.