If you read the article posted by Biowatch, the answer to your question is not known.
Very few researchers who believe there's a relationship between viruses or other pathogens and Alzheimer's get any funding whatsoever.
Those that do get funds, get very little preventing them from making rapid progress or getting a definitive answer one way or the other.
And the very small number that make some exceptionally worthwhile progress have a near impossible task in getting the editors of the most respected medical journals to publish their results.
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