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EVALUATION OF NA ENZYME LINKED IMMUNOSORBENT ASSAY (ELISA) USING PURIFIED, DEGLYCOSYLATED HISTOPLAMIN FOR DIFFERENT CLINICAL MANIFESTATIONS OF HISTOPLAMOSIS
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Yeshiva University. Albert Einstein College of Medicine. Department of Medicine & Microbiology and Immunology. Division of Infectious Diseases. New York, NY, USA.
Fundação Oswaldo Cruz. Instituto de Pesquisa Clínica Evandro Chagas. Laboratório de Micologia. Setor de Imunodiagnóstico. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto de Pesquisa Clínica Evandro Chagas. Laboratório de Micologia. Setor de Imunodiagnóstico. Rio de Janeiro, RJ, Brasil.
Universidade Federal do Rio de Janeiro. Instituto de Microbiologia Prof. Paulo de Góes. Rio de Janeiro, RJ, Brasil.
Yeshiva University. Albert Einstein College of Medicine. Department of Medicine & Microbiology and Immunology. Division of Infectious Diseases. New York, NY, USA.
Fundação Oswaldo Cruz. Instituto de Pesquisa Clínica Evandro Chagas. Laboratório de Micologia. Setor de Imunodiagnóstico. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto de Pesquisa Clínica Evandro Chagas. Laboratório de Micologia. Setor de Imunodiagnóstico. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto de Pesquisa Clínica Evandro Chagas. Laboratório de Micologia. Setor de Imunodiagnóstico. Rio de Janeiro, RJ, Brasil.
Universidade Federal do Rio de Janeiro. Instituto de Microbiologia Prof. Paulo de Góes. Rio de Janeiro, RJ, Brasil.
Yeshiva University. Albert Einstein College of Medicine. Department of Medicine & Microbiology and Immunology. Division of Infectious Diseases. New York, NY, USA.
Fundação Oswaldo Cruz. Instituto de Pesquisa Clínica Evandro Chagas. Laboratório de Micologia. Setor de Imunodiagnóstico. Rio de Janeiro, RJ, Brasil.
Abstract
Diagnosis of invasive fungal diseases remains problematic, especially in undeveloped countries. We have developed an enzyme-linked immunosorbent assay (ELISA) for the detection of antibodies to Histoplasma capsulatum using metaperiodate treated purified histoplasmin (ptHMIN). Our ELISA was validated comparing sera from patients with histoplasmosis, related mycoses, and healthy individuals. The overall test specificity was 96%, with sensitivities of 100% (8/8) in acute disease, 90% (9/10) in chronic disease, 89% (8/9) in disseminated infection in individuals without HIV infection, 86% (12/14) in disseminated disease in the setting of HIV infection and 100% (3/3) in mediastinal histoplasmosis. These parameters are superior to the use of untreated histoplasmin in diagnostic ELISAs. The high specificities, sensitivities, and simplicity of our ELISA support further development of a deglycosylated HMIN ELISA for clinical use and for monitoring the humoral immune response during therapy in patients with chronic and disseminated histoplasmosis.
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