Creutzfeldt-Jakob Disease (CJD)

Transmissible Spongiform Encephalopathy (TSE)

CJD is a rare incurable disease of humans that affects the nervous system and results in rapidly progressive dementia, loss of motor control, paralysis, and death. It is one of several related diseases called transmissible spongiform encephalopathies or TSEs for short. The term "encephalopathy" means the brain is affected, and the term "spongiform" refers to the microscopic holes seen in the brain, giving it a sponge-like appearance. 

Various animal species have distinct types of TSEs. In addition to CJD which affects humans, other TSEs include bovine spongiform encephalopathy (BSE, also known as "mad cow disease"), scrapie in sheep, and chronic wasting disease (CWD) in deer and elk.

CJD is caused by an agent, called a prion, that is a self-replicating protein. The current theory is that the normal form of the prion, found in all people, is converted into an abnormal form that causes cell death and the resulting brain lesions.

Additional Info Group

Last Revised: February 12, 2015