NCVP - National Center for Veterinary Parasitology

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  • Home
  • Resources
    • People >
      • Directors and Advisory Board
      • Residents >
        • Boehringer Ingelheim Resident
        • Elanco Resident
        • IDEXX Resident
        • Merck Resident
        • Zoetis Resident
      • NCVP Alums
      • Clinical Parasitology Support
      • Additional Support
      • Sponsors
    • Parasite Image Database >
      • Protozoa
      • Arthropods
      • Nematodes
      • Trematodes
      • Cestodes
      • Acanthocephala
      • Tick-Borne Disease Agents
    • Case of the Month
    • Teaching and Research Materials >
      • Teaching Specimen Request
      • Parasite Jeopardy Games
      • Parasite Videos
    • Online Resources >
      • Parasitology Board Preparation
      • Additional Parasitology Resources
      • Resources for Educators
    • NCVP Board Member Resources
    • NCVP Zoom Backgrounds
    • Residents' Corner
  • News
    • Veterinary Parasitology in the News
    • NCVP Newsletter
  • Opportunities
    • Request for Proposals
    • Residency Application
    • Continuing Education in Parasitology
    • Positions Open in Veterinary Parasitology

Case of the Month

February 2015

 

​Necropsy of a black Angus calf

An owner in Alva, Oklahoma lost 5 to 6 calves that were 4-6 weeks of age to an unknown illness. The calves were treated with several different antibiotics prior to death. Necropsy revealed mild inflammation of the small intestine, small 1/2 cm diameter hemorrhages in the cecum, and loose green stool throughout the intestinal tract. A fecal flotation was performed on a cecal wall scraping and the following organism was observed.
100X total magnification
Picture
400X total magnification:
Picture
What is your diagnosis?
Case kindly provided by Dr. Jerry Ritchey, anatomic pathologist and professor at Oklahoma state University Center for Veterinary Health Sciences. Photos provided by Becky Duncan-Decoq, research technician at the Oklahoma Diagnostic Laboratory at Oklahoma State University.

Answer

These are oocysts of Eimeria zuernii, a causative parasite of winter coccidiosis. The onset of clinical signs corresponds with parasite gametogony within the intestinal tract and the associated destruction of mucosal cells. Tenesmus and bloody diarrhea are typical clinical findings. The pathologist remarked that the level of infection and tissue destruction was the worst that he had seen in a coccidiosis case

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    Have feedback on the cases or a special case you would like to share? Please email us. We will appropriately credit all submittors for any cases and photos provided.