Yes, this is normal. I am constantly sanitizing and steam cleaning and yet what is going around out there, comes around in here. I know I have built a resistance to lots of bugs as I am now rarely affected (knock wood) Fortunately, I can keep my daycare kids seperate from my family and vice versa should anything be going around in either camp. I am always dumbfounded when something is going around like that croup, that most of the parents want to know who started it. I tell them everyone is going to start something at some point which they most likely picked up at the mall, so I am not going to waste my time issuing blame. (unless it is of course something like mumps or chicken pox etc.)