Diseases such as scrapie in sheep,"mad cow" disease in cattle,and Creutzfeldt-Jakob disease in humans are caused by
A)viroids.
B)viruses.
C)retroviruses.
D)TSEs (transmissible spongiform encephalopathies).
E)emerging viruses,for example Ebola.

Question

Quizplus · Accepted Answer

Diseases such as scrapie in sheep, "mad cow" disease in cattle, and Creutzfeldt-Jakob disease in humans are caused by TSEs (transmissible spongiform encephalopathies). They are not caused by viroids, viruses, or emerging viruses like Ebola. While there is some debate on whether or not they should be considered retroviruses, they are generally not classified as such.

Diseases Such as Scrapie in Sheep,"mad Cow" Disease in Cattle,and