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Immunodetection of Pneumocystis carinii in bronchoalveolar lavage specimens compared with methenamine silver stain
I Lautenschlager1, O Lyytikainen, L Jokipii
1Laboratory Department, Helsinki University Central Hospital, Finland.
Abstract:
Immunodetection of Pneumocystis carinii, based on immunofluorescence and use of a monoclonal antibody specific for an antigen located within the cyst wall and detectable after trypsin digestion only, was compared with a methenamine silver stain in 553 bronchoalveolar lavage specimens from immunosuppressed patients. P. carinii was found by immunofluorescence in 72 (86%) and by silver stain in 68 (81%) of the total of 84 positive samples detected by either or both of these methods.
Insights
Immunofluorescence, using a specific monoclonal antibody, detected Pneumocystis carinii in 86% of positive samples. This method showed higher sensitivity than traditional silver staining for diagnosing Pneumocystis pneumonia in immunosuppressed patients.
Area of Science:
- Medical diagnostics
- Immunology
- Microbiology
Background:
- Pneumocystis carinii pneumonia (PCP) is a significant opportunistic infection in immunosuppressed individuals.
- Accurate and sensitive diagnostic methods are crucial for timely treatment of PCP.
Purpose of the Study:
- To compare the diagnostic performance of an immunofluorescence assay with a standard methenamine silver stain for detecting Pneumocystis carinii.
- To evaluate the efficacy of a novel monoclonal antibody-based immunofluorescence technique.
Main Methods:
- Immunofluorescence assay utilizing a monoclonal antibody specific to a cyst wall antigen, requiring trypsin digestion.
- Comparison with conventional methenamine silver staining.
- Analysis of 553 bronchoalveolar lavage specimens from immunosuppressed patients.
Main Results:
- Pneumocystis carinii was detected by immunofluorescence in 72 (86%) of positive samples.
- Methenamine silver stain identified Pneumocystis carinii in 68 (81%) of positive samples.
- Immunofluorescence demonstrated a higher detection rate compared to silver stain.
Conclusions:
- Immunofluorescence, employing a specific monoclonal antibody, offers a sensitive and effective method for diagnosing Pneumocystis carinii infections.
- This immunodetection technique shows improved diagnostic yield over methenamine silver stain in bronchoalveolar lavage specimens.
