A sample from an abscess is stained and examined under the microscope. A Gram stain appears uniformly pink, but a GMS (Gomori methenamine silver) stain reveals brownish filaments in the sample. These findings suggest

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The uniformly pink Gram stain indicates the presence of organisms that do not retain the crystal violet stain, suggesting they are not typical bacteria. The GMS stain revealing brownish filaments is characteristic of fungi, particularly dematiaceous (darkly pigmented) fungi, which are associated with phaeohyphomycosis.

A Sample from an Abscess Is Stained and Examined Under