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[Serodiagnosis in pulmonary tuberculosis. Clinical evaluation]
T Sánchez Montón1, F Martín Luengo
1Servicio de Medicina Interna, Hospital General Universitario de Murcia.
Enfermedades Infecciosas Y Microbiologia Clinica
|May 1, 1992
Summary
This study found elevated immunoglobulin A (IgA), immunoglobulin G (IgG), and immunoglobulin M (IgM) antibody levels in tuberculosis patients compared to healthy individuals and those with other lung diseases. These antibody levels can aid in diagnosing pulmonary tuberculosis with 90% efficacy.
Area of Science:
- Immunology
- Infectious Diseases
- Pulmonology
Background:
- Pulmonary tuberculosis diagnosis relies on various methods, but improved serological markers are needed.
- Immunoglobulin (antibody) levels, including IgA, IgG, and IgM, can indicate immune responses to infections.
Purpose of the Study:
- To evaluate the diagnostic potential of specific antibody levels in pulmonary tuberculosis patients.
- To compare antibody profiles between tuberculosis patients, healthy controls, and patients with other pulmonary conditions.
Main Methods:
- Enzyme-linked immunosorbent assay (ELISA) was used to measure IgA, IgG, IgM, and IgG subsets (IgG1-IgG4) in 200 tuberculosis patients and control groups.
- Purified tuberculin and Ag60 from M. bovis were employed as antigens.
- Statistical analysis compared antibody levels across groups.
Main Results:
- Tuberculosis patients exhibited significantly higher levels of IgA, IgG, IgM, IgG2 (p<0.01), and IgG4 (p<0.05) compared to all control groups.
- No significant differences in antibody levels were observed among the different control groups.
- A diagnostic combination of IgG plus IgA or IgM achieved 90% efficacy in identifying tuberculosis.
Conclusions:
- Elevated IgA, IgG, and IgM antibody levels are indicative of pulmonary tuberculosis.
- Combining IgG with IgA or IgM offers a highly effective diagnostic tool for pulmonary tuberculosis, particularly when acid-fast bacilli smears are positive.