That's right. Living in the UK and taking an interest in popular science during the "mad cow disease crisis"[0], I had been aware that prion diseases can be transmitted in humans if (for example) you eat (infected) brains of your dead ancestors[1], but the headline as originally submitted ("Scientists document first-ever transmitted Alzheimer's cases") did suggest to me that we might be at the start of something altogether new and much more alarming.

[0] https://en.wikipedia.org/wiki/Bovine_spongiform_encephalopat...

[1] https://en.wikipedia.org/wiki/Kuru_(disease)