Anavex Life Sciences Corp (AVXL)

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"Even though we really concentrate on these plaques and tangles in Alzheimer's disease, it looks like it's the brain's immune system — the very primitive immune system of the brain — that's gone awry," Tanzi says, "and the plaques and tangles are a part of that system."
The question now is: What's causing the glitch in the ancient immune system?
One possibility is that it's overreacting to viruses and bacteria that get into the brain. Or, the system could be getting confused and attacking healthy cells — a lot like what happens in diseases like lupus or multiple sclerosis.
If either idea holds up, it may be possible to interrupt the process before it causes Alzheimer's, Moir says. "That's a pretty good outcome from a couple of Coronas 10 years ago."

https://www.npr.org/sections/health-shots/2018/02/18/580475245/scientists-explore-ties-between-alzheimers-and-brains-ancient-immune-system

At least it helps to explain why the plaques and tangles causal theory could not be proven. Billions and years down the chute.