I agree .... why would you WANT to make a villager sick? I start out ALL my healers with a trip around the village examining all the herbs/flowers/strange plants, and keep at it until they know them all. It is a part of their healing knowledge. At this point they are trainees, and I let them go to find the rest of their training as people NATURALLY get sick. There is enough work, especially when you have a full village of 115 to keep them busy on their own without MAKING anyone sick.