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Sarcocystis encephalomyelitis in sheep

Sarcocystis encephalomyelitis in sheep. Josepha DeLay Animal Health Laboratory, University of Guelph. History. 200+ ewe flock acute onset neurologic signs confined to 1 pen of 8 month old lambs 17 / 40 affected over a 10 day period

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Sarcocystis encephalomyelitis in sheep

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  1. Sarcocystis encephalomyelitis in sheep Josepha DeLay Animal Health Laboratory, University of Guelph

  2. History • 200+ ewe flock • acute onset neurologic signs confined to 1 pen of 8 month old lambs • 17 / 40 affected over a 10 day period • 2 / 17 dead (1 necropsied), 4 additional affected lambs euthanized and necropsied

  3. Clinical findings • Clinical signs: • Depressed • Anorexic • Blind • Head / body tremors, weakness, hindlimb ataxia Differential diagnoses: polioencephalomalacia, listeriosis Initial therapy: thiamine, tetracycline – no response

  4. Sarcocystisspp IHC (cerebellum) bar 50 um Brain (medulla oblongata), lamb C Brain (midbrain), lamb B bar 10 um

  5. Sarcocystisspp IHC (myocardium) Skeletal muscle, lamb B Myocardium, lamb C

  6. fromM.Jeffrey, 1993, In Practice, 15: 2-8.

  7. Additional history • New guardian dogs purchased ~2 months prior to onset of neurologic disease in flock • Dogs were acclimatized to sheep by housing in sheep barn, with access to feed bunk area of pen housing affected sheep

  8. Outcome: • 3 treatment groups based on pathology diagnosis • Amprolium • Toltrazuril • No treatment • Improvement in mental status and appetite regardless of treatment • No additional sick lambs or deaths in 2 months following initial outbreak

  9. Thank you to OVC collaborators on this case: • Dr. Andrew Peregrine • Dr. Paula Menzies • Dr. Jonathan Huska • Dr. Luis Gaitero

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