I'm toying with a fanfiction again... vaguely-medieval world with a lot of magic, and some sort of obvious wound which slowly kills a person. I'm playing with how amputation hasn't been thought of. She's under the care of a midwife with equivalent skill to a military field surgeon. Even with potent alchemists existing, they don't have penicillin. Does anyone know a resource where I can find descriptions of untreated infections? I'm looking for a slow "we can't cure her" death.