Indeed, cases of iatrogenic Creutzfeldt–Jakob’s disease (CJD) have been induced by the use of contaminated growth hormone derived from cadaver with undiagnosed CJD infections and by transfusion of blood products (Brown, 1988; Llewelyn et al., 2004; Wroe et al., 2006; Brown et al., 2012). Here, GH1 is linked to Creutzfeldt Jacob disease.