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Comparison of dot-ELISA and standard ELISA for detection of Neisseria meningitidis outer membrane complex-specific
Elza Ft Belo1, Calil K Farhat, Elizabeth N De Gaspari
1Immunology Section, Instituto Adolfo Lutz, São Paulo, SP, Brazil.
Abstract:
Dot-ELISA using the outer membrane complex antigens of Neisseria meningitidis as a target was standardized for rapid detection of meningococcal-specific antibodies in human serum. We investigated the level of meningococcal-specific IgG, IgA, and IgM in serum using dot-ELISA with outer membrane antigens prepared from Neisseria meningitidis serotype B:4.19:P1.15,3,7,9 (a strain isolated from a Brazilian epidemic). The dot-ELISA is based on the same principles as the standard ELISA and is useful for detection of anti-N. meningitidis B antibodies in serum of patients with meningococcal infections. For the assay, outer membrane complexes (OMCs) were absorbed by nitrocellulose membrane and blocked with a 5% skim milk solution. Serum samples were drawn upon hospital admission and during convalescence from patients with meningococcal septicemia, and single samples were drawn from uninfected controls. We retrospectively examined a total of 57 serum samples: 35 from patients infected with N. meningitidis B, 12 from patients infected with Haemophilus influenzae b, and 10 from health individuals. When performed at room temperature, dot-ELISA took approximately four hours to perform, and the optimum antigen concentration was 0.42 microg per dot. The specificity of IgG, IgM, and IgA demonstrates that dot-ELISA using OMCs from N. meningitidis B as a target is suitable for serologic verification of clinically suspected meningococcal disease in patients and for titer determination of antibodies produced during different phases of natural infection. Furthermore, the sensitivity of dot-ELISA was comparable to that of standard ELISA. Overall, dot-ELISA is simple to perform, rapid, and low cost. Further validation of the test as a screening tool is required.
Insights
A new dot-ELISA method rapidly detects Neisseria meningitidis antibodies in human serum. This low-cost assay is suitable for diagnosing meningococcal disease and determining antibody levels during infection.
Area of Science:
- Immunology
- Microbiology
- Diagnostic Assays
Background:
- Neisseria meningitidis causes severe infections, necessitating rapid diagnostic tools.
- Serological detection of specific antibodies is crucial for diagnosing meningococcal disease.
- Standard ELISA methods can be time-consuming and resource-intensive.
Purpose of the Study:
- To standardize and evaluate a dot-ELISA for detecting Neisseria meningitidis-specific antibodies (IgG, IgA, IgM) in human serum.
- To assess the diagnostic utility of dot-ELISA for meningococcal infections.
- To compare the performance of dot-ELISA with standard ELISA.
Main Methods:
- Outer membrane complexes (OMCs) from Neisseria meningitidis serotype B were used as antigens.
- OMCs were immobilized on nitrocellulose membranes for dot-ELISA.
- Serum samples from patients with meningococcal septicemia, Haemophilus influenzae b infections, and healthy controls were tested.
- Dot-ELISA was performed at room temperature, with antigen concentration optimized.
Main Results:
- The dot-ELISA successfully detected Neisseria meningitidis-specific IgG, IgA, and IgM antibodies.
- The assay demonstrated high specificity and sensitivity comparable to standard ELISA.
- The procedure took approximately four hours to complete.
- Optimal antigen concentration was determined to be 0.42 microg per dot.
Conclusions:
- Dot-ELISA using Neisseria meningitidis serotype B OMCs is a rapid, simple, and low-cost method for serologic verification of meningococcal disease.
- The assay is suitable for determining antibody titers during different phases of infection.
- Further validation is recommended for its use as a screening tool.
