Mostly I do not get it, usually can rub it on my skin and won't get it.
Seems funny, you can touch it, rub up against it, or inhale the smoking fumes and dern near die....but to get immunity you must EAT the leaves.....
(I DO NOT RECOMMEND THIS, NOR AM I ENDORSING THE IDEA, SO I WILL NOT BE HELD LIABLE IF YOU GET BLISTERED LIPS or ITCHY HEMMOROIDS)
Read on.....
[The first step in immunizing yourself is to gather a young budding poison ivy leaf in the spring with a pair of tweezers, and eat it. Then, as the leaves grow, you will consume one leaf per day until you are “stuffing down” a mature leaf. And, I mean stuffing. The less chewing you do, the better. Big leaves should be cut down to pieces that you can swallow whole. After you have “finished off’ a mature leaf, the immunization process, which can take three to four weeks, is completed.
If you can not get yourself to munch on a poison ivy leaf, you can encapsulate the leaves and swallow them as a daily medication. Encapsulating them is a wiser choice, because you do not run the risk of introducing the leaves’ poison oil to the skin around the mouth and lips. If you are just going to “pop” them in your mouth, make sure you are using tweezers and that you do not make any contact with your skin. The mucus membrane inside your mouth will protect it from any harmful effects. Always drink a glass of water after you ingest poison ivy.]
the link is here to read all about it......
http://www.wwmag.net/pivy.htm
http://www.arboristsite.com/showpost.php?p=2122842&postcount=4