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Enzyme-linked immunosorbent assay for brucella antigen detection in human sera
1Department of Clinical Sciences, London School of Hygiene and Tropical Medicine.
Journal of Medical Microbiology
|January 8, 1999
Summary
A new sandwich enzyme-linked immunosorbent assay (ELISA) accurately detects brucella antigen in serum. This brucellosis diagnostic method shows high sensitivity and specificity, offering a viable alternative to blood cultures.
Area of Science:
- Immunology
- Microbiology
- Infectious Diseases
Background:
- Brucellosis remains a significant global health concern, necessitating improved diagnostic tools.
- Current diagnostic methods for brucellosis, such as blood culture and serological tests, have limitations in sensitivity and specificity.
- Early and accurate diagnosis is crucial for effective treatment and control of brucellosis.
Purpose of the Study:
- To evaluate a novel sandwich enzyme-linked immunosorbent assay (ELISA) for the direct detection of brucella antigen in human serum samples.
- To determine the sensitivity, specificity, and diagnostic agreement of the developed ELISA assay compared to established brucellosis diagnostic methods.
- To assess the potential of ELISA-based antigen detection as a reliable alternative for brucellosis diagnosis.
Main Methods:
- Development and optimization of a sandwich ELISA utilizing monoclonal antibodies for brucella antigen capture.
- Determination of assay detection limits using spiked serum samples with known concentrations of brucella cells and lipopolysaccharide (LPS).
- Clinical validation of the standardized ELISA assay on a diverse cohort including random blood donors, confirmed brucellosis patients, high-risk individuals, and patients with other diseases.
Main Results:
- The optimized ELISA demonstrated a detection limit of 100 brucella cells/well or 10(5) fg/ml of LPS in spiked specimens.
- The assay exhibited 100% sensitivity when compared to positive blood cultures, indicating excellent agreement for detecting active brucellosis.
- Specificity was high, with 99.5% in random blood donors and 99.2% in the patient population, minimizing false positive results.
Conclusions:
- The developed sandwich ELISA for brucella antigen detection is a sensitive and specific diagnostic tool.
- Antigen detection via ELISA shows strong concordance with blood culture results, suggesting its utility in diagnosing brucellosis.
- ELISA-based antigen detection presents a promising and potentially more accessible alternative to conventional blood cultures for brucellosis diagnosis.