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Local anti-P32 humoral response in tuberculous meningitis
J P Van Vooren1, C M Farber, E Noel
1Chest Department, Hopital Erasme, Bruxelles.
Abstract:
We report five cases of severe pulmonary tuberculosis admitted to hospital with a suspicion of meningeal involvement. The diagnosis of tuberculous meningitis was confirmed by standard bacteriological techniques in two of the five patients. Specific IgG class antibodies directed against the recently purified BCG antigen P32 were detected by a dot immunoblotting technique in the serum and in the cerebrospinal fluid of each patient; however, a higher anti-P32 immunoglobulins/total immunoglobulins ratio was observed in the cerebrospinal fluid of patients with tuberculous meningitis than in their serum while the reverse situation was observed in the other patients.
Insights
Diagnosing tuberculous meningitis can be challenging. This study found specific antibodies against BCG antigen P32 in cerebrospinal fluid, aiding diagnosis in severe pulmonary tuberculosis cases.
Area of Science:
- Infectious Diseases
- Neurology
- Immunology
Background:
- Severe pulmonary tuberculosis poses diagnostic challenges, especially when meningeal involvement is suspected.
- Standard bacteriological techniques have limitations in confirming tuberculous meningitis.
- The need for improved diagnostic markers for tuberculous meningitis is critical.
Purpose of the Study:
- To investigate the utility of specific IgG antibodies against BCG antigen P32 for diagnosing tuberculous meningitis.
- To compare the ratio of anti-P32 immunoglobulins to total immunoglobulins in serum and cerebrospinal fluid.
Main Methods:
- Case series of five patients with severe pulmonary tuberculosis and suspected meningeal involvement.
- Bacteriological confirmation of tuberculous meningitis.
- Dot immunoblotting technique to detect IgG antibodies against BCG antigen P32 in serum and cerebrospinal fluid (CSF).
Main Results:
- Tuberculous meningitis was confirmed in two of the five patients.
- Specific IgG antibodies against BCG antigen P32 were detected in all patients' serum and CSF.
- A higher anti-P32 immunoglobulin/total immunoglobulin ratio was observed in CSF compared to serum in patients with tuberculous meningitis.
Conclusions:
- Detection of specific IgG antibodies against BCG antigen P32 may serve as a valuable diagnostic marker for tuberculous meningitis.
- The elevated anti-P32 immunoglobulin ratio in CSF suggests localized immune response in the central nervous system.
- This serological marker shows promise for improving the diagnosis of tuberculous meningitis in conjunction with clinical and bacteriological findings.