The really interesting thing here is that Alzheimer's seems to be transmissible from person to person via biological material. The BBC headline you quoted, "Medicine stopped in 1980s linked to rare Alzheimer's cases", totally buries the lede and is borderline misleading.
While it's certainly understandable that we are all tired of clickbait that purposefully misleads the reader, imo we should not overcorrect by demanding that headlines cannot be misinterpreted by arbitrarily ignorant readers.
[0] https://en.wikipedia.org/wiki/Bovine_spongiform_encephalopat...
Alzheimer's being an infectious disease is still being researched. The article does nothing to disprove it.
It may not be infectious like a cold or herpes, but it was amazing to me that it is transmissible. I spent some time Googling and it looks like the appropriate term is "Donor-Derived Infections."
I know our brains are very protected in our bodies and for good reason but I still wonder how far we will be able to go if we can ever safely and humanely bypass that.