PRNP and infection: In contrast, PRNP from reindeer 2 and 60 were heterozygous at bases 4 (codon 2, V/M), 385 (codon 129, G/S), 413 (codon 138, S/N), and 505 (codon 169, V/M) of PRNP (cervid numbering), and completely resisted infection with CWDELK up to 60 mpi (Table 1).