Which of the following statements is true regarding Creutzfeldt-Jakob disease?

Creutzfeldt-Jakob disease (CJD) is indeed considered always fatal. This neurodegenerative disorder, caused by prions, leads to rapid cognitive decline, neurological dysfunction, and ultimately death, typically within a year of onset. The fatal nature of CJD is a significant characteristic, as there are currently no effective treatments or therapies to halt its progression or reverse its effects.

The other statements do not hold true for CJD: it cannot be treated effectively, it does not only affect young adults (it can occur in persons of various ages but is more common in older adults), and there is no vaccine available to prevent the disease.