H. capsulatum capsulatum intracytoplasmic yeasts

Thoracic papular skin lesion in a patient infected with HIV: Giemsa staining, x400 – Histoplasma capsulatum var. capsulatum (dimorphic fungi). Parasitic yeast intracellular forms in a mononuclear cell. These forms are round or oval form, 2 to 3 µm in diameter ; the cell wall is hardly stained with the Giemsa (clear halo) giving a false appearance of capsule.