Histoplasma

Histoplasma 1 (Canine 1) ARROWS
Histoplasma capsulatum in monocytes. Canine.

Morphology: intracellular yeast-like organisms with a pseudocapsule in the cytoplasm of neutrophils and monocytes. May be 1 – 20 organisms per cell. Organisms may be present in > 25% of neutrophils and monocytes.

Look alike: Babesia

Clinical relevance: Histoplasma capsulatum is a dimorphic fungus that exists as a mycelial form in the environment and as a yeast form in a host’s body. Causes severe (often fatal) disease with variable clinical signs depending on organ systems affected (chronic GI signs most common in dogs, respiratory signs most common in cats).

Histoplasma 2 (Canine 2) ARROWS
Histoplasma capsulatum in monocytes. Canine.

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