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Caryospora-associated dermatitis in dogs.

J P Dubey1, S S Black, L T Sangster

  • 1Livestock and Poultry Sciences Institute, U.S. Department of Agriculture, Beltsville, Maryland 20705.

The Journal of Parasitology
|August 1, 1990
PubMed
Summary
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Severe pyogranulomatous dermatitis in a young dog was linked to the coccidium Caryospora sp. Various developmental stages were identified in skin and lymph node tissues, confirming the parasitic infection.

Area of Science:

  • Veterinary Pathology
  • Parasitology
  • Immunohistochemistry

Background:

  • Canine pyogranulomatous dermatitis can have various etiologies.
  • Caryospora is a genus of coccidian parasites, typically affecting reptiles, but occasionally found in mammals.

Observation:

  • A 2-month-old dog presented with severe pyogranulomatous dermatitis.
  • Numerous developmental stages of Caryospora sp. were identified within macrophages, connective tissue cells, and other host cells in skin and lymph node biopsies.
  • Observed stages included schizonts (up to 20 microns, 25 merozoites), gamonts, oocysts, and caryocysts (up to 18 microns, 1-3 sporozoites).

Findings:

  • The identified coccidium exhibited multiple developmental stages within the canine host tissues.
  • Immunoperoxidase staining with anti-Caryospora bigenetica serum showed positive reactions across all observed developmental stages, confirming the parasitic identification.

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Implications:

  • This case highlights Caryospora sp. as a potential cause of severe dermatitis in young dogs.
  • The findings expand the known host range for Caryospora and demonstrate its pathogenic potential in mammals.
  • Immunohistochemistry is a valuable tool for identifying parasitic stages in tissue samples.