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A rapid enzyme-linked immunosorbent assay (ELISA) for the detection of human class-specific antibodies to Histoplasma capsulatum (histoplasmal immunoglobulin M [HIgM] and histoplasmal IgG [HIgG]) was developed by using antigen adsorbed onto polycarbonate-coated ferrous beads. In the ELISA method all the reagents used were commercially available. In 135 specimens from patients with confirmed histoplasmosis, sensitivities were 76% for complement fixation (CF), 53% for immunodiffusion (ID), and 64% for the ELISA for HIgM and HIgG combined. The ELISA detected histoplasmal antibody in 36% of the specimens with negative antibody titers by CF and 46% of the specimens with negative antibody titers by ID. The ELISA detected histoplasmal antibody in 27% of specimens that were negative by both CF and ID. When limited to specimens collected within 4 months of the onset of histoplasmosis symptoms, sensitivities were 82% for CF, 63% for ID, and 86% for ELISA for HIgG and HIgM combined. Within this group, ELISA detected histoplasmal antibody in 90% of the specimens that were negative by CF, 76% that were negative by ID, and 100% that were negative by both CF and ID. The specificity of the ELISA could not be fully addressed since sera from patients with other fungal infections were not available.

Evaluation of an enzyme-linked immunosorbent assay that uses ferrous metal beads for determination of antihistoplasmal immunoglobulins G and M