My son has had pinworms 3 times in a year. We treated the whole family with both doses and did the proper house cleaning measures (ugh the constant laundry!!) . He hasn't had symptoms in about a year now. There was no evidence any of the rest of us had it. But I learned that at any point in time like 40% of all kids have it and don't even know it. They just think they have an itchy butt. Great way to spread the eggs all over the place. So honestly, I don't even worry about it anymore, but I'm happy to hear that my son hasn't had the butt tickle in a long time!