Could you give me some smaller notes? <a href=" http://www.jasonclarke.net/essay-on-my-hobby-reading-books-in-urdu/ ">macbeth gcse essay</a> CJD is known as a prion disease, which means it can affect both humans and animals. It is a very rare form of dementia and tends to affect people between the ages of 50 and 80. However in the 1990s, a new variant (vCJD) of the disease was identified, which affects people at a much younger age. Research indicates that vCJD is caused by cross infection from cattle with BSE (mad cow disease), in other words, it is contracted through eating infected meat.