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  • Title: Pneumocystis carinii pneumonia. An approach to rapid laboratory diagnosis.
    Author: Cameron RB, Watts JC, Kasten BL.
    Journal: Am J Clin Pathol; 1979 Jul; 72(1):90-3. PubMed ID: 88179.
    Abstract:
    Laboratory procedures used to establish the diagnosis of Pneumocystis carinii pneumonia were evaluated using an experimental murine model. Touch preparations and suspension smears were prepared from lung tissue know to contain Pneumocystis cysts. These preparations were stained by a variety of methods known to demonstrate either cyst forms or sporozoites and trophozoites. Suspension smears proved to be superior to touch preparations in terms of cyst content and homogeneity of staining. Also, methods that stain cyst forms were superior to those that stain sporozoites and trophozoites for location and identification of organisms. The authors believe that suspension smears prepared from lung tissue and stained with toluidine blue O should be examined initially as a rapid screening method for Pneumocystis cysts. When the results of this initial screen are negative or inconclusive, additional suspension smears stainded by the modified Gomori methenamine silver nitrate method should be examined, pending availability of histologic sections.
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