Creutzfeldt-Jakob disease
Mum dies from rare dementia years after catching it from own baby while pregnant
Doctors believe son inherited mutated gene responsible for disease from father, before passing it back to his mother while in the womb.
Brain-maiming protein may have spread via surgery: study
Hygiene standards are more stringent now, but the capacity of brain-attacking proteins to withstand sterilisation is still unknown.
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