Scrapie is an infectious and fatal disease in sheep. It is one of several diseases classified as Transmissible Spongiform Encephalopathies (TSE) and is the most common. Please visit the USDA and the National Institute for Animal Agriculture to learn more about the disease. The Veterinary Genetics Laboratory has been approved by USDA/APHIS to perform sheep genotyping for the prion protein gene at codons 136, 154 and 171.