It would be interesting if the disease caused the host to be inclined to spread it.
Here's a fun fact: Toxoplasma gondii causes rats to like cats (feces) instead of fearing them, making them prone to being eaten by cats - which is great for the parasite as it reproduces in cat's alimentary system. Incidentally, humans with Toxoplasmosis are over-represented in traffic accidents, which may suggests some of that recklessness effect carries over.
[1] https://www.techradar.com/news/the-last-of-us-hbo-tv-show
https://www.psychologytoday.com/us/blog/darwins-subterranean...
https://evesdrift.com/2014/01/01/change-in-human-social-beha...
https://scholar.google.com/scholar?cites=1349985915923183693...