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Vet Pathol 39:363-371 (2002)
© 2002 American College of Veterinary Pathologists

Cryptosporidium muris–like Infection in Stomach of Cynomolgus Monkeys (Macaca fascicularis)

J. P. Dubey, J. E. Markovits and K. A. Killary

Parasite Biology, Epidemiology and Systematics Laboratory, Animal and Natural Resources Institute, Agricultural Research Service, United States Department of Agriculture, Beltsville, MD (JPD); and Novartis Pharmaceuticals, East Hanover, NJ (JEM, KAK)

Protozoa were present in routine sections of the gastric fundus of 15 cynomolgus monkeys (Macaca fascicularis) that were being studied in three toxicity studies with novel immunosuppressive agents. Upon detailed light microscopic and ultrastructural evaluation, all stages of parasite development (trophozoites, schizonts, gamonts, and oocysts) were seen and they structurally resembled Cryptosporidium muris, which normally is found in stomachs of rodents. Cryptosporidia were primarily present in the upper one third of fundic glands that were often concurrently colonized by a Helicobacter heilmannii–like organism; however, no clear correlation was found between bacterial burden and the number of protozoa. The primarily mononuclear cellular infiltrate appeared to coincide with the presence of protozoa only in a few animals. Changes in mucous epithelial cells mainly occurred in animals that were part of a 39-week study. Mucous epithelial cells in affected glands contained an increased amount of mucus composed of predominantly acid mucosubstances compared to the normally present neutral mucosubstances. C. muris–like protozoa are newly recognized etiologies for opportunistic infections in the stomach of immunocompromized nonhuman primates. This is the first report of C. muris-like parasite in stomachs of monkeys.

Key words: Cryptosporidium muris; cynomolgus monkeys; electron microscopy; Macaca fascicularis; oocysts; schizonts; stomach.

Request reprints from Dr. J. P. Dubey, Parasite Biology, Epidemiology and Systematics Laboratory, Animal and Natural Resources Institute, Agricultural Research Service, United States Department of Agriculture, Building 1001, Beltsville Agricultural Research Center, Beltsville, Maryland 20705-2350 (USA). E-mail: jdubey{at}anri.barc.usda.gov.




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