When I got PI I was really sick, so off to the doc I went. WEll two shots and three scripts later I found out I was seriously sick not just itchy. IT was effecting my breathing too. So I was off work for 10 days and on meds the whole time. Man, and I never even touched it. It was in my neighbors yard. I had no way of knowing accept by seeing the bags of greens by the steet for pickup......so we had a little talk and they agreed to tell me when they were going to do this each year and I would go to my brothers for the weekend.......I haven't had it since.