Caryospora-Associated Dermatitis in Dogs

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Abstract
Numerous developmental stages of Caryospora sp. were seen in and lymph node of a 2-mo-old-dog with severe pyogranolomatous dermatitis. Schizonts were up to 20 .mu.m long and contained up to 25 merozoites. Gamonts, unsporulated oocysts, sporulated oocytsts, and carocysts were seen in macrophages, connective tissue cells, and in unidentifiable host cells. Caryocysts were up to 18 .mu.m long, and had thin walls, and contained a host cell nucleus and 1-3 sporozoites. All developmental stages of the coccidium reacted positively with anti-Caryospora bigenetica serum when examined in an immunoperoxidase test.