Cerebrospinal nematodosis caused by <i>Parelaphostrongylus</i> species in an adult bull

  • Evelyn E. MacKay
    Departments of Large Animal Clinical Sciences (MacKay, Washburn) and Veterinary Pathobiology (Fratzke, Porter), College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX
  • Alycia P. Fratzke
    Departments of Large Animal Clinical Sciences (MacKay, Washburn) and Veterinary Pathobiology (Fratzke, Porter), College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX
  • Richard W. Gerhold
    Departments of Large Animal Clinical Sciences (MacKay, Washburn) and Veterinary Pathobiology (Fratzke, Porter), College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX
  • Brian F. Porter
    Departments of Large Animal Clinical Sciences (MacKay, Washburn) and Veterinary Pathobiology (Fratzke, Porter), College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX
  • Kevin E. Washburn
    Departments of Large Animal Clinical Sciences (MacKay, Washburn) and Veterinary Pathobiology (Fratzke, Porter), College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX

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<jats:p> A 2-y-old Brahman bull was presented with progressive hindlimb ataxia and paraparesis that led to recumbency. Postmortem examination revealed scattered pinpoint, red-brown foci within the brainstem and gray matter of the spinal cord, and a larger lesion within the spinal cord at the level of T13. Histology of the section of T13 contained cross-sections of nematodes consistent with Parelaphostrongylus tenuis. Evidence of inflammation was present in other affected areas of the spinal cord and brain. DNA extraction and nested PCR were performed, which demonstrated 98% identity and 100% coverage to both P. tenuis and P. andersoni. Our case highlights the utility of DNA sequencing in parasite identification. </jats:p>

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