I live in North Mississippi and have this same plant you are describing everywhere~ I have thought all this time that it was poison ivy, until I saw pics of the Virginia Creeper. That looks just like what is growing all over (literally) our place. But I also have a nasty, blistery rash from the top of my forehead to the tops of my feet. And everywhere in between...LITERALLY. From bikinin line too palms of hands and also buttocks! So am I that allergic to Virginia Creeper?