Does anyone know of a proven method/vaccination I can get for poison ivy? I thought that I had just about grown immune to the stuff (I've been getting it since I was a kid) but recently got a pretty good dose. To make matter worse, I was just in the woods whre I bought a bunch of tops for firewood and the suff is on almost every tree. It is choking some full sized tree out. I have heard of some old wives tales but I would really rather rely on some modern medicine. Anyone with some advice (don't give the "stay out of the woods" advice, it's not an option this summer.