It's poison oak in the west, poison ivy in the east. Two different species but both contain the same active "poison" urushiol.
I get the allergic reaction pretty bad. But the stuff is all over in my area. The most important thing to do is to wash all exposed skin HARD when you're done. I keep a small container of Dawn dish soap in the shower and use lots to scrub with a washcloth, two or three times. Scrub like you're covered in the stickiest grease you can imagine. If in doubt scrub more. If I have been anywhere near any PO like today I throw the clothes in the washing machine before I hit the shower. I had to deal with an oak that fell because the PO in it was so heavy it pulled it over. The PO stem was bigger than my wrist. Yuck yuck yuck.
Zanfel didn't do a thing for me. Tech-Nu is only good for cleaning the oil off your skin, it doesn't help the alergic reaction. Dawn works better and costs less. When I get an allergic reaction I use a steroid cream that I got my Dr to prescribe- Mometasone Furoate. That stuff works, though it can take multiple applications over days. I have had to take Prednisone a few times. It's got nasty side effects so I try hard to not get it that bad.