Never heard of anyone get it on the soles of their feet before, that's interesting since the skin is similar to your palms.
Funny story... we live in what was once a very popular vacation getaway during the Railroad age, folks taking the train out of the city to stay in some local lodges and enjoy the clean cooler air in summer, getting away from the foil and stifling hot city ca.1850's - 1960's. All that business is long-since dead, but one of the remnants left behind is a lot of public trails and camping grounds, some just walking distance from my house.
So, I'm out with the kids cycling on one of the trails years ago, when I come across a group of two guys and their girlfriends walking around barefoot in a field of foot-tall poison ivy. I mean, just a total sea of the stuff, so dense nothing else was growing. I heard them commenting that it was amazing no one else had taken that spot, as they were stringing up their hammocks, the guys were shirtless in cutoff jeans shorts and the girls in bikini tops.
My wife or son asked if I was going to warn them, but from what they'd already set up I could see that they'd already been trapsing all over the stuff for quite awhile, and figured there wasn't much point in a warning anymore. They were probably only minutes away from starting to feel their mistake.
There's a tree I'd like to winch down, but it has a big trunk of poison ivy and the neighbor spotted a rattler near it a week or two ago. I'm going to wait until cold weather.
My great-grandfather was killed by a rattler, right here in New Hope PA. He managed to catch and kill the thing, cutting off its rattle, which my grandmother somewhat morbidly kept in the top drawer of a dresser I still own today. I'm not sure what happened to the rattle itself, last I saw it was right before grandma died in the early 1990's.
Point being, most locals would insist we don't have rattlesnakes around here... but we do! This would have been 1930'ish, but my father reported seeing them at one of our neighboring properties as late as 1980, and I see no reason they'd have abandoned since.