NAVLE® Question of the day

A three-year-old male neutered Labrador retriever from the Ohio river valley basin is presented with a six-week history of mixed bowel diarrhea, cough, lethargy, and weight loss.

A lymph node aspirate reveals round to ovoid (1-4 µm) encapsulated structures inside macrophages and giant cells as shown in the image below.

What is the diagnosis?

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