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Pneumococcal antigen in lobar pneumonia
Abstract:
This paper describes the value in diagnosis and the clinical implications of the detection of pneumococcal antigen in patients with lobar pneumonia. Ninety-eight patients with lobar pneumonia were investigated. Pneumococcal antigen was detected by counter-current immunoelectrophoresis in the sputum of 79% of patients with purulent sputum, in the serum of 29% of the patients, and in the urine of 54% of the patients. The diagnostic value of counter-current immunoelectrophoresis was not affected by prior antibiotic therapy. Patients with antigenaemia had a higher incidence of complications than those without as shown by an association between antigenaemia and jaundice, diarrhoea, and persistent pyrexia. Antigen persisted in the circulation for at least seven days in half the patients studied, possibly indicating the development of immunological tolerance to the polysaccharide antigen.
Insights
Detecting pneumococcal antigen in patients with lobar pneumonia aids diagnosis and reveals clinical implications. This antigen detection is valuable even after antibiotic treatment and correlates with increased patient complications.
Area of Science:
- Medical Microbiology
- Infectious Diseases
- Clinical Diagnostics
Background:
- Lobar pneumonia remains a significant cause of morbidity and mortality.
- Accurate and timely diagnosis of bacterial pneumonia is crucial for effective treatment.
- Strengthening diagnostic methods for pneumococcal pneumonia is an ongoing clinical need.
Purpose of the Study:
- To evaluate the diagnostic utility of detecting pneumococcal antigen in patients with lobar pneumonia.
- To explore the clinical implications of pneumococcal antigen detection, including associated complications.
- To assess the impact of prior antibiotic therapy on antigen detection.
Main Methods:
- Investigated 98 patients diagnosed with lobar pneumonia.
- Employed counter-current immunoelectrophoresis (CIE) for pneumococcal antigen detection.
- Analyzed antigen presence in sputum, serum, and urine samples.
Main Results:
- Pneumococcal antigen was detected in 79% of purulent sputum, 29% of serum, and 54% of urine samples.
- Diagnostic value of CIE was unaffected by previous antibiotic administration.
- Antigenaemia (presence of antigen in serum) was associated with higher complication rates (jaundice, diarrhea, persistent fever).
- Circulating antigen persisted for at least seven days in 50% of patients, suggesting potential immunological tolerance.
Conclusions:
- Detection of pneumococcal antigen via CIE is a valuable diagnostic tool for lobar pneumonia.
- Antigenaemia serves as an indicator of increased risk for severe clinical complications.
- The persistence of antigen may imply the development of immunological tolerance in some patients.