When I was teaching, I remember SO many kids coming in and having a high fever or throwing up within a half hour of arrival - so you KNOW those kids were exhibiting some symptoms at home. It's so frustrating. However, without fever or flu symptoms, it's really hard to stay home all the time. Also, another post noted that people can spread germs when they don't have symptoms. My son is absolutely NEVER sick because I boost his immune system with a top quality supplement. He can be around really sick people and the most he will get is a slight sniffle for a day. He hasn't missed a day of school since he's been doing this supplement. My friend has 4 kids - same thing - not one missed day. Another friend has 2 kids, and the younger one has been on the supplement since birth - healthiest child I've ever seen. So I think you can't keep people home from things especially if it's not your house, although I think you can call ahead and say "I have a newborn and I really need to protect her/him at this early stage in life." I think you just have to control what you can control -- your own distance, the handwashing, and strengthening from inside.