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I've looked at a few studies recently regarding rhinovirus and how it spreads. Rhinovirus is is supposed to be responsible for ~50% of all colds, but the airborne route for getting an infection from it is a really low risk - one study I read could not isolate the virus at all from coughs and sneezes.

Not sure how true this is for other viruses responsible for colds/flu though, but it can be somewhat reassuring for those concerned with contracting a cold via the air they're breathing.