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Acute blindness due to suspected ivermectin toxicosis in a foal
A lot of potential clinical signs can be expected in ivermectin toxicosis, varying from ataxia, depression, salivation to coma or even death in severe cases. This case is interesting but unusual: acute blindness in a very young foal. The good news: It recovered completely...

A 9-week-old miniature mule foal presented to the Veterinary Medical Teaching Hospital for acute blindness, ataxia, and depression following an overdose of an over-the-counter ivermectin-based de-worming medication.

Ophthalmic examination and electrodiagnostic evaluation eliminated outer retinal abnormalities as the primary cause of the bilateral blindness, implicating instead a central neurologic effect of the drug.

With symptomatic and supportive care, the foal recovered fully and regained its vision.



Source: Plummer, Caryn E., Kallberg, Maria E., Ollivier, Franck J., Brooks, Dennis E. & Gelatt, Kirk N. (2006): Suspected ivermectin toxicosis in a miniature mule foal causing blindness. In: Veterinary Ophthalmology 9 (1), 29-32.




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EQUINE

Theiler´s disease in a Trakehner caused by contaminated tetanus vaccinemembers
An 11â€yearâ€old Trakehner gelding was presented for evaluation of lethargy, decreased appetite, mild icterus, and elevated hepatic enzyme activities. Physical examination, serum chemistry results, and liver biopsy histopathologic findings were supportive of Theiler`s disease. Polymerase chain reaction (PCR) testing results of serum and liver tissue were positive for nonprimate (equine) hepacivirus (NPHV) and a novel equine parvovirusâ€hepatitis virus (EqPVâ€H). A serious and finally fatal problem, caused by contaminated vaccine.

  • Limbal squamous cell carcinoma in a Rocky Mountain Horse and geneticsmembers
  • Subconjunctival bupivacaine, lidocaine, and mepivacaine and the corneal sensitivity in horsesmembers
  • Clodronate in horses with lamenessmembers
  • Valacyclovir in horses with equine multinodular pulmonary fibrosismembers
  • Radiculopathy associated with forelimb lameness in horsesmembers
  • Biological variations of routine blood parameters in horsesmembers
  • Prognosis for horses with deep digital flexor tendon injury after penetrating woundmembers
  • Possible maternal effect for the pace trait of horsesmembers
  • Flecainide on induced atrial fibrillation in horsesmembers
  • Sonographic technique to identify manica flexoria tears in horsesmembers
  • Novel prototype dynamic laryngoplasty system on arytenoid abductionmembers
  • Lipid peroxidation biomarkers in equine neuroaxonal dystrophymembers


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