I was reading through a WarHammer Fantasy Roleplay supplement the other night, and there was a chapter about physicians and surgeons. There were rules for contracting infection, both before and after surgery. Do you use rules like that? Is there a chance that your (non-magical) healer will cause an infection in the person they are trying to patch up? It doesn't seem like much fun for those trying to run heroic games, but it might be interesting for an added dose to those running games higher in realism.
On which end of the spectrum do you fall?