A friend of mine took the advice of a very old herbalist. When the new leaves first started coming on the vines he took a small piece 1/4x1/4?, put it on some light bread, folded the bread to make an encasement, then swallowed it. You got to be careful not to transfer any of the oil on you. He does that ever year and instead of getting shots he will just have a mild issue with it.
Next year save you some acorns in the freezer. When you have an outbreak crush them, chop them up in a blender to a powder, make a paste and apply it to the affected areas. This works to clear it up for most folks.