GH1 and Creutzfeldt Jacob disease: Finally, cases of iatrogenic CJD (iCJD) account for fewer than one percent of all known cases and have been reported in patients (1) subjected to corneal or dura mater grafts (whose donors died with CJD), (2) treated with human growth hormones (hGH) or gonadotropins derived from the pituitary gland of cadavers, and (3) subjected to brain surgery with contaminated electrodes (previously used in the brain of patients with CJD) [10,11,12,13,14,15,16,17].