Comment by toast0

Taking an optional test is voluntary.

Entering a study for people who tested positively would also be voluntary.

Anecdotal responses in this topic indicate there may be some mitigatimg medicines.

Demanding a root cause before doing anything is silly. Finding root cause in biological systems is incredibly difficult; there's value in finding symptoms and managing symptoms without finding a root cause. And dangers of focusing too much on any one indicator.

That's not to say I suggest everyone be screened for everything. If there are limited mitigations, it's not appropriate for most people to be screened. But even if there are no medical mitigations, you might put your affairs in order with appropriate urgency if you knew your cognition would be much reduced in the next 5-10 years.