Good info. There is a joke on the island in southern Ontario that I spring turkey hunt on. They said that scientists identified 20 types of poison ivy plants and 24 of them where found to be on the island
. I do what is suggested here and have been for years and it works. Years ago I asked the locals what they did and they all just do this. As far as being immune by contact or eating it I know people that have lived on this island for generations and they aren't immune I guess they need to eat more !