http://safety.lovetoknow.com/Hand_Sanitizer_Dangers
Opening your windows even on the coldest days for minimum of 15 minutes to air out the house will remove most airborne viruses.
I open my windows in my main area of the daycare daily for 1/2 to an hour each day. Even the nap room gets aired out. My daycare kids hardly get sick, we also try and get as much fresh air as possible.