"Unless your cat lived a significant part of it's life as an outdoor cat, it is very unlikely to have the parasite (like any parasite). Most cat to human transmission (again, minority of total transmissions) comes from stray cats infecting gardens with their feces."

https://news.ycombinator.com/item?id=45947121

Otherwise “simple infections” are (likely, almost obviously) responsible for tons, including dementia, Parkinson’s, more,

and they’re the ones everyone ignores,

or struggle to even get a diagnosis for,

and instead say “it’s normal to not be able to squat once, or have any energy when you’re ‘getting older’!”.

These infections can drive…completely life-changing medical trajectories - without the patient ever noticing.

Everyone just thinks they won the “reverse—lottery” when cancer or dementia finally shows up…I’m becoming less convinced it’s a “chance” thing at all.

We just don’t see, nor monitor the beginnings - and if we do happen upon them, hey, “everybody has Staph, EBV, [insert bacteria or virus here] - nothing to be worried by! Very common!”