"Myth: Some people are so sensitive to poison ivy that they can catch it just by being near the plant.
Reality: You have to touch the plant to get poison ivy - just being close to it will not get urushiol on your skin. "
You can also get it airborne. Burning leaves ot trash that have poison ivy in it, will get the oils airborne and if they settle on someone sensitive to it, they will break out.
And if they inhale it...