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IgG and/or IgM antibodies against mycobacterial cord factor (trehalose 6,6'-dimycolate, TDM) in sera of 65 patients of Hansen's disease (21 cases with smear-positive and 44 cases with smear-negative) and 60 healthy individuals were tested by enzyme-linked immunosorbent assay (ELISA) with TDM purified from Mycobacterium tuberculosis H37Rv as an antigen. Of 65 patients with Hansen's disease, 58 cases (89.2%) had positive results (21 samples from 21 patients, 100% with acid-fast bacilli positive in the lesion, and 37 samples from 44 patients, 84.0% with acid-fast bacilli negative Hansen's disease diagnosed clinically). The sensitivity and specificity of anti-cord factor ELISA were higher than those of anti-phenolic glycolipid-I (PGL-I) agglutination test. Among the total, 34 patients were classified clinically into three types of the disease, lepromatous leprosy (LL), borderline lepromatous (BL) and borderline tuberculoid (BT). The antibody titer showed LL &gt; BL &gt; BT, indicating that the elevation of anti-cord factor antibody titers appeared to be parallel with the degree of humoral immune response against M. leprae. By using semisynthetic cord factor consisting of a single subclass of mycolic acid from M. tuberculosis, it was revealed that sera from patients with Hansen's disease were highly reactive against alpha-mycoloyl cord factor (alpha-TDM) and less reactive against methoxy mycoloyl TDM (methoxy TDM), differed from sera of tuberculosis patients, which were highly reactive against both methoxy and alpha-mycoloyl cord factor (alpha-TDM). Most of sera from patients with Hansen's disease were more reactive against TMM than TDM, differed from sera of tuberculosis patients which were highly reactive against TDM. ELISA using TDM as an antigen is simple, reproducible and useful for the rapid serodiagnosis of Hansen's disease, especially for smear-negative cases.

Serodiagnosis of Hansen's Disease/Leprosy by Enzyme-Linked Immunosorbent Assay Using Cord Factor(trehalose 6,6'-dimycolate) as an Antigen.