The correlation is probably loosely causative based on other research pointing to certain infections preceding a descent into Alzheimer's or Dementia.
Related (not exhaustive. The infectious theory is rapidly gaining ground especially in light of anti-beta-amyloid drugs repeatedly failing in clinical trials):
* HSV/Alzheimer's: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8234998/
* HSV/Alzheimer's: https://content.iospress.com/articles/journal-of-alzheimers-...
* HSV/Alzheimer's: https://pubmed.ncbi.nlm.nih.gov/29488144/ (current independent phase 2 trial to reproduce outcomes: https://clinicaltrials.gov/ct2/show/NCT03282916)
* Gingivitis/Alzheimer's: https://pubmed.ncbi.nlm.nih.gov/32280099/
* Immunological role of Beta-Amyloid: https://alz-journals.onlinelibrary.wiley.com/doi/full/10.100...
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