IgM aCL, anti-ß2GPI, and aPT antibody levels in normal controls (NC), and in patients with HIV, leprosy (Le), syphilis (Sy), malaria (Ma), hepatitis C (HC). The upper limit of normal set at 5SD above the mean level of the normal controls, was 9.6 MPL for aCL, 4.5 AEU for anti-ß2GPI, and 16 AEU for aPT.