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Comment by josh-wrale

12 hours ago

Not always. Genetic causes are known.

... which kind of points to the indicator that "Alzheimer != Alzheimer", implying that too many diseases with the same side effects are categorized together?

A lot of virological and parasitical components have historically been wrongly associated with genetic markers, too. Toxoplasmosis parasite comes to mind.

[1] https://en.wikipedia.org/wiki/Toxoplasmosis

[2] https://en.wikipedia.org/wiki/Toxoplasma_gondii