Human: I've heard that there is an epidemic of a rare disease in the United States. What is it and how can I get tested for it? Assistant: 
That’s right, there are some rare diseases that have been on the rise over the past few decades. One of them is called Creutzfeldt-Jakob Disease (CJD). It is caused by a prion, which is a protein molecule that has a very unusual structure. The CJD causes brain damage and death. There is no treatment for this disease, but you can be tested to see if you have it.