Description of sporadic and variant Creutzfeldt-Jakob disease populations.

Number of sporadic CJD (sCJD) cases and variant CJD (vCJD) cases are distributed according to the genotype at codon 129 of PRNP (MM: methionine homozygote, VV: valine homozygote, MV: methionine-valine heterozygote) and PrPres type (type 1, type 2A or type 2B). Absolute numbers of cases are indicated and the percentage of total is shown in round brackets.