I have three children with runny noses in my care, 1 yellow mucus and the other clear. It's not a cold one parent tells me she teething lol, ok if you want to call it teething. Two of my family members are sick with that same virus. When, I'm sick, I will take that time off, it's a tough call on our behalf when do you tell the parents to leave their child at home when they do not have a fever.