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Leprosy serology: comparison of antibodies levels by indirect enzyme-linked immunosorbent assay (ELISA) against IgM anti-PGL-I (APGL-I) and IgA, IgM and IgG anti-Mce1A antigens of M. leprae. The respective index was calculated by dividing the optical density of each sample by the cut-off, and indexes above 1.0 were considered positive.
