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Meningococcal antigen in diagnosis and treatment of group A meningococcal infections
Abstract:
Meningococcal antigen was measured by countercurrent immunoelectrophoresis in the blood and cerebrospinal fluid of 200 patients with group A meningococcal meningitis. Antigen was detected in the blood of 27 (13.5 per cent) patients. These patients had a worse prognosis and a higher incidence of allergic complications, such as arthritis and vasculitis, about 5 days after the start of antibiotic treatment. Antigen was found in the CSF of 129 (67.5 per cent) patients); antigen often persisted in the cerebrospinal fluid despite antibiotic treatment before admission. A combination of immunoelectrophoresis and routine bacteriologic study was used in the diagnosis of 162 (84.8 per cent) patients with meningococcal meningitis. High levels of antigen and a slow antigen disappearance were associated with neurologic damage. The antigen is stable and may be detected from specimens of cerebrospinal fluid dried on filter paper.
Insights
Detecting meningococcal antigen in blood and cerebrospinal fluid (CSF) aids in diagnosing group A meningococcal meningitis. Antigen presence, especially persistent CSF antigen, indicates a worse prognosis and potential neurological damage.
Area of Science:
- Microbiology
- Immunology
- Infectious Diseases
Background:
- Meningococcal meningitis remains a significant cause of morbidity and mortality.
- Accurate and timely diagnosis is crucial for effective treatment and improved patient outcomes.
Purpose of the Study:
- To evaluate the utility of detecting meningococcal antigen in blood and cerebrospinal fluid (CSF) for diagnosing group A meningococcal meningitis.
- To correlate antigen detection and persistence with clinical prognosis and complications.
Main Methods:
- Countercurrent immunoelectrophoresis was employed to detect meningococcal antigen in blood and CSF samples from 200 patients.
- Diagnostic accuracy was assessed by combining immunoelectrophoresis with routine bacteriologic studies.
- Antigen levels and disappearance rates were analyzed in relation to patient outcomes.
Main Results:
- Meningococcal antigen was detected in the blood of 13.5% and in the CSF of 67.5% of patients.
- Patients with detectable blood antigen showed a worse prognosis and increased allergic complications.
- Persistent CSF antigen, even after antibiotic treatment, was observed, and high antigen levels/slow disappearance correlated with neurological damage.
Conclusions:
- Countercurrent immunoelectrophoresis is a valuable tool for diagnosing meningococcal meningitis, particularly when combined with bacteriologic studies.
- Meningococcal antigen detection in blood and CSF provides prognostic information and identifies patients at risk for complications.
- The stability of the antigen allows for its detection in dried CSF specimens, facilitating diagnosis.