Low Information Voter on Nostr: So, so many. Cholera comes to mind (bacterial) CJD (prion) Various forms of mass ...

So, so many.

Cholera comes to mind (bacterial)

CJD (prion)

Various forms of mass hysteria (psychological)

Then there are weird edge cases like Rheumatoid Arthritis: epidemology and paleontology looks /exactly/ like a pathogen (inducing an autoimmune response to the tissues it hides among) except we've looked, a lot, and no microcritter has been convicted yet.