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Streptococcus pneumoniae infection. (A). On routine hematoxylin and eosin staining, the organisms present a fine granular blue appearance in a background of more eosinophilic fibrinous exudate. The round blue structure are the nuclei of degenerated inflammatory cells. (B) Silver impregnation methods highlight many bacterial forms, making their morphology more discernible in black (Dieterle silver stain). Both images original magnification, ×400.
