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[Coagglutination test and its application to the rapid diagnosis of meningococcal meningitis]
Abstract:
Modified technique of slide coagglutination test for detecting meningococcal group-specific antigens in the spinal fluid of patients with meningococcal meningitis has been developed. Precipitating meningococcal sera, groups A, C, X, Y, Z, were conjugated with formalin-treated staphylococcal cells, strain Cowan-I. To prevent nonspecific reactions, 5-minute boiling of the spinal fluid specimens is suggested. 111 specimens of spinal fluid were taken from 75 patients at different periods of the disease. All patients were administered antibiotics, and therefore the etiology of the disease was bacteriologically confirmed only in 31% of patients. Coagglutination test was positive in 56.7% of patients, the frequency of positive results reaching 71% during the first 4 days of the disease. The specimens of spinal fluid taken from the control group of patients yielded not more than 2% of the positive results. Coagglutination test is recommended as a rapid test for diagnosing meningococcal meningitis.
Insights
A modified coagglutination test aids in detecting meningococcal antigens in spinal fluid. This rapid diagnostic method is recommended for identifying meningococcal meningitis, especially early in the disease.
Area of Science:
- Microbiology
- Immunology
- Clinical Diagnostics
Background:
- Meningococcal meningitis diagnosis can be challenging, especially when antibiotic treatment precedes laboratory confirmation.
- Rapid and accurate detection of Neisseria meningitidis antigens is crucial for timely treatment.
Purpose of the Study:
- To develop and evaluate a modified slide coagglutination test for detecting meningococcal group-specific antigens in cerebrospinal fluid (CSF).
- To assess the test's efficacy in diagnosing meningococcal meningitis, particularly in patients receiving antibiotics.
Main Methods:
- Conjugation of group-specific meningococcal antisera (A, C, X, Y, Z) with formalin-treated Staphylococcus aureus (Cowan-I).
- Inclusion of a 5-minute boiling step for CSF specimens to minimize non-specific reactions.
- Testing 111 CSF specimens from 75 patients with suspected meningococcal meningitis and a control group.
Main Results:
- The modified coagglutination test showed a positive result in 56.7% of patients.
- Positive results reached 71% within the first 4 days of illness.
- Control group CSF specimens yielded a maximum of 2% positive results, indicating high specificity.
Conclusions:
- The modified slide coagglutination test is a sensitive and specific method for rapid diagnosis of meningococcal meningitis.
- The test is particularly valuable in identifying the disease early and in cases where bacterial culture is negative due to prior antibiotic use.