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The Korean Journal of Cytopathology 1997;8(1): 27-34.
Immunocytochemical Detection of Pneumocystis Carinii in Bronchoalveolar Lavage .
Kun Young Kwon, Seung Che Cho, Sang Pyo Kim, Kwan Kyu Park, Eun Sook Chang, Chung Sook Kim
Department of Pathology and Institute of Medical Science, Keimyung University School of Medicine.
Pneumocystis carinii is an established cause of pulmonary infections in immuno- compromised hosts. Several cytological stains, such as Papanicolaou, Gomori methenamine silver(GMS) and Diff-Quik have been used for detection of the organism, but occasionally can be laborious and, due to a degree of nonspecificity, may be misleading. We evaluated the diagnostic utility of immunocytochemical stains that recognize P. carinii in bronchoalveolar lavage from experimentally induced P. carinii pneumonia rats(n=15). In addition to routine stains for diagnosis by morphologic recognition of P. carinii on Papanicolaou, GMS and Diff-Quik stains, bronchoalveolar lavage samples were reacted with immunocytochemical stains using monoclonal antibodies(MAB) 092 and 902. In bronchoalveolar lavage P. carinii organisms were detected in 9 of 10 cases (90%) using each MAB 092 and 902, whereas GMS and Diff-Quik stains demonstrated P. carinii in 13(86%) and 11(73%) of 15 cases respectively. In lung tissue specimens(n=15) P. carinii organisms were well identified on GMS stain and immunohistochemical stains using MAB 092 and 902 in all cases. We believe that the immunocytochemical staining using MAB 092 and/or 902 is a very useful and diagnostic tool in addition to GMS and Diff-Quik stain to detect P. carinii organisms in bronchoalveolar lavage.
Key Words: Pneumocystis carinii; Gomori methenamine silver; Diff-Quik; Immunocy- tochemical staining; Bronchoalveolar lavage