scrapie

Scrapie might sound like a minor skin problem, but it is actually a fatal disease that affects the nervous system of sheep and goats. It is not caused by a scrape or small injury. It is a brain disease that makes animals become more nervous, lose coordination, and eventually lose the ability to stand.

The most alarming part of the disease is its cause: prions. These are infectious, misfolded proteins that can stay in the environment for many years, including on pasture and farm equipment. Because the disease can last so long and is hard to remove, it is a major concern for farmers and animal health officials. In many ways, you can think of it as the sheep and goat version of "mad cow disease."

Scrapie is a serious, fatal, degenerative disease that targets the central nervous system of sheep and goats. The name is derived from a hallmark symptom: an intense, relentless itch that drives infected animals to rub against fences, trees, or rocks, literally "scraping" off their wool in a desperate attempt to find relief. However, this scraping is merely an external symptom of a much deeper, irreversible neurological decline.

The disease is unique because it isn't caused by a virus or bacteria, but by prions—misfolded versions of normal proteins. These prions accumulate in the brain and spinal cord, causing progressive damage. They are incredibly resilient, capable of surviving for years in the soil or on farm equipment, which makes the disease extremely difficult to eliminate once a flock is infected.

Scrapie is a "slow" disease, often taking years to manifest. Early symptoms might include subtle behavioral changes like nervousness or aggression, followed by tremors, a characteristic hopping gait, and eventually total paralysis and death. There is currently no cure or treatment.

Because of its long incubation period and economic impact, scrapie is a reportable disease in many countries. Farmers must implement rigorous biosecurity measures, including genetic testing to identify sheep with natural resistance and the culling of infected animals to prevent further spread. It belongs to the family of transmissible spongiform encephalopathies (TSEs), which includes bovine spongiform encephalopathy (BSE) in cattle and Creutzfeldt-Jakob disease in humans. While the name evokes simple scratches, scrapie remains one of the most complex and challenging disorders in veterinary medicine.