I agree with bugaboo that you can't give the option of not coming to pick up the child. I liked her suggestion of asking who is comign if not the mother. Although it may not have prevented the outbreak because often things are contagious before the symptoms appear, at least you would be able to assure the other parents that the child was sent home as soon as you noticed symptoms. A rash is definitely one of the things listed in my contract as a reason to be sent home immediately.