All are true about Creutzfeldt-Jacob Disease EXCEPT
**Core Concept**
Creutzfeldt-Jakob Disease (CJD) is a rare, degenerative, and fatal brain disorder caused by an abnormal form of a protein called a prion. Prions are infectious agents that can cause normal brain proteins to misfold, leading to brain damage and death.
**Why the Correct Answer is Right**
CJD is a transmissible spongiform encephalopathy (TSE) characterized by rapid progression of neurological symptoms, including memory loss, personality changes, and coordination problems. The disease is caused by the accumulation of abnormally folded prion protein (PrP^Sc) in the brain, which leads to neuronal damage and death. The exact mechanism of prion transmission is not fully understood, but it is believed to occur through direct contact with contaminated tissues or through the consumption of infected food products.
**Why Each Wrong Option is Incorrect**
**Option A:** Prions are infectious agents that can cause normal brain proteins to misfold, leading to brain damage and death. Incorrect because this statement is true about CJD.
**Option B:** CJD is a transmissible spongiform encephalopathy (TSE) characterized by rapid progression of neurological symptoms. Incorrect because this statement is also true about CJD.
**Option C:** The exact mechanism of prion transmission is not fully understood, but it is believed to occur through direct contact with contaminated tissues or through the consumption of infected food products. Incorrect because this statement is true about CJD.
**Option D:** CJD can be transmitted through blood transfusions from an infected donor. Incorrect because this statement is false; while CJD can be transmitted through certain medical procedures, such as corneal transplantation, it is not typically transmitted through blood transfusions.
**Clinical Pearl / High-Yield Fact**
It's worth noting that CJD is often confused with other neurodegenerative diseases, such as Alzheimer's disease, but it has distinct clinical and pathological features. A key differentiator is the rapid progression of symptoms in CJD, which typically occurs over a period of months.
**Correct Answer: D. CJD cannot be transmitted through blood transfusions from an infected donor.**