We don't have poison ivy or poison oak on our property. We've looked very carefully, and there is none. The problem is that we have acreage to search, and he was clearing lots of brush and weeds and other assorted things when it happened. I'm almost thinking that it's the wild roses that he cut down. Our neighbor said she got on infection from them, so maybe they are the culprit. Still can't figure out how it got on his legs, but at least is it almost gone now. I took to sleeping in the guest room! Couldn't get an ounce of sleep with all that scratching!
We've asked the other people in our area, and they have never seen poison oak or ivy here. I really don't think that could be it.