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[–] MinorLeakage 0 points 1 point (+1|-0) ago 

What if there's a slight breeze? The "distancing" is beyond horseshit if you have a basic understanding of a little phenomenon we like to call "wind".

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[–] MadJack 0 points 1 point (+1|-0) ago 

Good point. No word on that.

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[–] MinorLeakage 0 points 1 point (+1|-0) ago 

Another point is "positive pressure". Almost every large building has higher air pressure inside than the outside air pressure. The simple act of opening the door blasts air and thus particles onto the person entering. What about cold air returns and updrafts?