From one infection to 23 moreThe infected person who boarded the bus that fateful day wasn't showing symptoms, just yet. (Those critical hours right before a person starts feeling sick are often when people are most contagious with the coronavirus.) On the first bus, sitting near the infected person didn't seem to matter most when it came to getting sick. A seating chart shows how one infected bus rider (red) infected many others, even those who weren't sitting close by. Even on airplanes, enclosed spaces where the air is very well purified, and people now wear masks, the risk of getting infected is not zero.