Hey there! I'm sorry about your friend, and having to take her daughter to daycare. It's not true that you can inhale particles, that could only possibly happen if you were right next to someone as they were getting sick. The way that the virus spreads is through getting vomit or fecal particles from someone who is sick on your hands, and touching your mouth. SO, the gist of this is that the best way to avoid catching anything is to wash your hands before eating, and try not to touch your face or put your hands in your mouth before you've washed them.