8 ms·

So, someone sick goes into an elevator/bus/small places, they cough, and get on. The guy coming 5 mins later, having no clue, might get infected.... And whi

• 34679 7y ago
  Someone sick walks into a building with central air/heating without HEPA filtration or sterilization, walk past a return vent, and the virus gets sucked in and sent out throughout the whole building.
• GuB-42 7y ago
  Don't forget the "viable on surfaces up to days" part. Someone coughs on a doorknob, hours later, you touch the doorknob, virus goes on your hand, you touch your face, you get infected. Even if you don't touch your face, your dirty hands spread the virus everywhere, including on food and to other people. And even if touch isn't the main vector, it is better than nothing. Remember that the goal is to make the rate of transmissions less than 1, so if washing hands help us go down from 1.1 to 0.9, even if isn't that much of a difference, it is all we need to beat the virus.