Scrapie in Goats: Progressive Neurologic Disease, Testing, and What Owners Should Know

Scrapie is a fatal, progressive neurologic disease of sheep and goats caused by a prion, which is an abnormal form of a naturally occurring protein. It belongs to a group of diseases called transmissible spongiform encephalopathies, or TSEs. In goats, the disease slowly damages the central nervous system over months to years.

Many pet parents first notice vague changes rather than one dramatic symptom. A goat may separate from the herd, lose weight despite eating, become unusually reactive, or develop an odd gait. The classic "scratching" behavior that gave scrapie its name is common in sheep, but it is less consistent in goats, so the disease can be easy to miss early on.

Scrapie matters not only because it is serious for the individual goat, but also because it has herd and regulatory implications. In the United States, suspected cases should be discussed with your vet right away so appropriate testing and reporting steps can be followed.

Scrapie is caused by a prion, not a bacteria, virus, or parasite. Prions are abnormal proteins that trigger normal proteins in the body to misfold. Over time, this leads to damage in the brain and nervous system. The disease has a long incubation period, so infected goats may appear normal for years before signs develop.

Transmission patterns in goats are still important even when no sheep are present. Historically, classical scrapie in goats was often linked to contact with infected sheep, but goat-to-goat transmission also occurs. Exposure is thought to happen through infected tissues and contaminated environments, especially around kidding and birth fluids, although exact risk can vary by strain and management conditions.

Not every goat exposed will show disease in the same way or on the same timeline. Genetics may influence susceptibility, and there are different forms of scrapie, including atypical forms. For pet parents, the key point is that this is not caused by routine care mistakes. It is a serious infectious protein disease that requires veterinary guidance and official testing pathways.

Scrapie cannot be diagnosed based on signs alone. Your vet will usually start with a full history, neurologic exam, and discussion of herd exposure, movement records, age, and any official scrapie identification. Because many other conditions can mimic scrapie, your vet may also consider listeriosis, rabies, brain abscess, meningitis, CAE, Johne's disease, caseous lymphadenitis, dental disease, and cancer.

In the U.S., immunohistochemistry (IHC) is the official test used for scrapie diagnosis. In live animals, APHIS-approved testing may use rectal lymphoid biopsy or third-eyelid biopsy. Rectal biopsy is often preferred because it more often yields enough lymphoid follicles for interpretation. Even so, live-animal tests do not catch every infected goat, so a negative result does not always rule scrapie out.

For goats that die or are euthanized, postmortem testing is often the most informative route. Your vet may coordinate necropsy and submission of brainstem and lymphoid tissues to an approved laboratory. If scrapie is suspected, do not move, sell, or dispose of the animal without veterinary guidance, because sample quality, identification, and reporting steps matter.

Prevention focuses on herd biosecurity, traceability, and careful animal sourcing. Work with your vet before bringing in new goats, especially breeding animals. Ask about herd history, official scrapie identification, and whether there have been unexplained neurologic cases or chronic wasting problems. Avoid mixing your goats with animals of unknown status when possible.

Kidding management also matters. Because birth-related tissues and fluids are considered important in transmission risk, keep kidding areas clean, remove placental material promptly, and avoid exposing other goats to contaminated bedding. Good sanitation will not eliminate all risk, but it can reduce opportunities for spread.

If a goat develops suspicious neurologic signs, isolate it and contact your vet promptly. Do not sell, move, or casually dispose of the animal before getting guidance. In the U.S., official identification and participation in scrapie control programs can help with trace-back and herd protection. There is no vaccine or routine medication that prevents scrapie, so prevention depends on management and early veterinary involvement.