Everyone is allergic to urushiol (the oil in poison ivy). The difference is how much. Some people can get a rash right away. Others can be exposed multiple times before it shows up. But each exposure increases your reaction, ever so slightly.

I also thought I was immune and only the last time I was cleaning out a patch did I finally get a small rash.

The key is, you usually have a couple hours to clean it off before you react. It’s like motor oil - make sure you have something that cuts through it, like a degreaser. That fixes most of the problem.

Good luck everyone!