Interesting. I have been immune all my 57 years. Can roll in it and have accidentally done so with no harm. 10 years ago I got something trapped in a sock while brush busting that welled up pretty good. Since then I have brushed up against it several times with no adverse reaction. I have an aunt who would break out on skin when a neighbor was burning vines anywhere within a mile.
Same here, I've been on hikes where several people, if not everybody else got it when we all walked in the same places, but I never got an iota. I was changing a flat one night literally crawling in it and laying in it getting the spare from under a SUV. I didn't even notice until a helper with a flash light pointed it out too late, but to even my surprise, still nothing.
I have a friend who the least little bit, and he blisters and scabs up bad--like hospital bad. Like concrete burns, etc., we all have different tolerances for it I guess.
![[Linked Image]](http://s193.photobucket.com/user/bricky62/media/CJGAHGW.jpg.html)
