Yep our center puts up a sign on the door and a note in the child's bag as well. Mind you I once had a very sick bubby, who was quite young at the time, and I tried to wait it out a couple of days before going to the doctor. Well turns out the poor thing had bronchiolitis, and when I called daycare to inform them they said "oh by the way its going around the center". Well thanks for letting us know!!! So I feel your frustration. Also I must second what many have already said, DD used to catch everything under the sun and is now starting to not come home sick every week. Hang in there, its tough for a while but you get through it.