Disagree, despite your quote from some online medical dictionary . Small patch, one arm, covered with a wrap. No big deal. It is IMPOSSIBLE for poison ivy to spread between people. The main point is that people were just going hysterical over a minor problem and treating it like another Covid. Fortunately common sense is prevailing now anyway.
However it is correct to say the rash doesn’t spread it.
But the poison ivy rash is nasty as heck. It itches, it blisters, and the blisters burst leaking endless fluid out of them. I would NEVER go to an amp if I was in that situation. No one wants to deal with that. Gross.