I'm not supporting OP claims exactly but there does seem to be an apparent benefit in treating herpes with antivirals to reduce the incidence of Alzheimer's. There have been a few studies and this article gives a good rundown of those although it is a few years old and there have been even more studies since. https://www.healthline.com/health-news/how-are-cold-sores-an...

Also the claims about common vaccines appear to be somewhat supported in literature. Here is a summary article https://www.alzforum.org/news/conference-coverage/could-comm...