Yeah, it infects everything. Different kinds of animals, um... maybe ghosts, too. I'm still kind of unclear on that part.

[Sidequests are weird.]

I guess it's infectious at, like. Maybe every stage, because you see people with Starscourge and you see people turning into daemons and you see daemons just sort of spawning out of the dark and... and I definitely saw one dude's corpse get reanimated. Ugh...