I have walked into incidences like the one you described.... several times, years ago. One time I was in Wal-mart and heard an older lady cough and v* right next to me, just a few feet away. Of course I ran to find my husband, my kids, and we left. My night was ruined.... but I never got s* from it. There was also a time where I walked into a store where it had just happened. I almost stepped in it. It was all over the floor and the glass door; it was very new and the smell was awful. I didn't get s* from that one either. I have had more than those mentioned, and I did not get ill from any of the incidents that I walked into or around, thus possibly breathing in particles. Sounds like you will be just fine!!