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A Simple Fecal Flotation Method for Diagnosing Zoonotic Nematodes Under Field and Laboratory Conditions

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Canine intestinal histoplasmosis containing hyphal forms.

Loni L Schumacher¹, Brenda C Love, Mark Ferrell

¹Department of Veterinary Pathobiology, Oklahoma State University, Stillwater, OK 74078, USA.

Journal of Veterinary Diagnostic Investigation : Official Publication of the American Association of Veterinary Laboratory Diagnosticians, Inc

|March 21, 2013

Summary

A Miniature Schnauzer with chronic diarrhea was diagnosed with canine histoplasmosis. The study identified both yeast and hyphal forms of Histoplasma capsulatum in intestinal biopsies.

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Area of Science:

Veterinary Pathology
Mycology
Canine Infectious Diseases

Background:

Chronic diarrhea in dogs can be challenging to diagnose.
Histoplasmosis is a fungal infection caused by dimorphic fungi.

Observation:

A 12-year-old Miniature Schnauzer presented with refractory chronic diarrhea.
Histologic examination of intestinal biopsies revealed granulomatous enteritis and colitis.
Intralesional yeast and hyphal forms were observed.

Findings:

Grocott methenamine silver stains confirmed yeast and aseptate hyphae consistent with Histoplasma capsulatum.
Molecular identification confirmed Ajellomyces capsulatus (teleomorph of H. capsulatum).
This case demonstrated the coexistence of yeast and mycelial forms of H. capsulatum in canine histoplasmosis.

Implications:

Accurate identification of fungal elements is crucial for diagnosing histoplasmosis.
Understanding the dimorphic nature of H. capsulatum aids in diagnosis and treatment.
Successful treatment of canine histoplasmosis with itraconazole was achieved.