For info, the answer was that it was transmissible, but only during rare medical accidents from the past. The example cited was where some people (1959-85) were given growth hormones derived from deceased people with the disease. Proteins were transferred with the hormones which triggered early-onset Alzheimer’s.
‘Mad Cow Disease’ alerted medicine to the potential for this kind of protein transfer, and such treatments were withdrawn.
So technically yes, but only with medical intervention, and using techniques abandoned forty years ago.
