the experiments done were on how far these sorts of particles can travel, not on how infectious they are. so if we know a potentially infectious particle can tr

the experiments done were on how far these sorts of particles can travel, not on how infectious they are. so if we know a potentially infectious particle can travel 2m then we know the best chance to avoid infection is to not get in that radius. it doesn't mean you won't get it outside that radius or that you will get it inside that radius, just that the opportunity to catch it is increased or decreased based on distance.