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The article mentions that explicitly though [0]

It also doesn’t mean it’s not communicable or contagious, it means we don’t know because it seems no one have looked yet [1]

[0] It is important – imperative – to emphasize that transmissible does not equal contagious. There is absolutely no evidence that people with dementia can spread their disease casually to people around them.

[1] Since Alzheimer’s Disease is so common, and we have not (to my knowledge) been looking for Alzheimer's caused by surgical or other medical procedures that access eye or neural tissue -- particularly in patients for whom the appearance of Alzheimer’s would not be surprising -- is it possible that we are underestimating the transmission potential of this disease, and that such events are less rare than we would guess?

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