https://en.wikipedia.org/wiki/Creutzfeldt%E2%80%93Jakob_disease https://en.wikipedia.org/wiki/Creutzfeldt%E2%80%93Jakob_dise... Classification section, quote:

https://en.wikipedia.org/wiki/Creutzfeldt%E2%80%93Jakob_disease https://en.wikipedia.org/wiki/Creutzfeldt%E2%80%93Jakob_dise... Classification section, quote: Sporadic (sCJD), caused by the spontaneous misfolding of prion-protein in an individual.[20] This accounts for 85% of cases of CJD.[56] Familial (fCJD), caused by an inherited mutation in the prion-protein gene.[55] This accounts for the majority of the other 15% of cases of CJD.[56] Acquired CJD, caused by contamination with tissue from an infected person, usually as the result of a medical procedure (iatrogenic CJD). Medical procedures that are associated with the spread of this form of CJD include blood transfusion from the infected person, use of human-derived pituitary growth hormones, gonadotropin hormone therapy, and corneal and meningeal transplants.[55][56][57] Variant Creutzfeldt–Jakob disease (vCJD) is a type of acquired CJD potentially acquired from bovine spongiform encephalopathy or caused by consuming food contaminated with prions.[55][58]