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To optimize diagnosis of histoplasmosis in tissue sections, 30 spleen specimens from mice, experimentally infected with Histoplasma capsulatum, were examined by H&amp;E, Grocott stain, anti-bacille Calmette-Guerin antibody immunostain, Fungiqual A fluorochrome stain (Drs Reinehr and Rembold, Kandern, Germany), and a nested polymerase chain reaction (PCR) assay. Results were compared with the tissue burden determined by quantitative culture. By applying logistic regression, the nested PCR assay was the most sensitive method, but not significantly more sensitive than the Grocott stain. The 50% quantile to achieve a positive result was determined to be 3 colony-forming units per milligram of spleen tissue for the PCR assay, 11 for the Grocott stain, 27 for the fluorochrome stain, 190 for immunostaining, and 533 for the H&amp;E stain. The Grocott and fluorochrome stains did not differ significantly in detecting fungal elements. The PCR assay unambiguously identified H. capsulatum in tissue sections.

Comparison of Staining Methods and a Nested PCR Assay to DetectHistoplasma capsulatumin Tissue Sections