I wonder what the result would have been if you immediately gargled with vodka.

I've used that successfully in the past to chase colds out of the throat before they get into my nose and lungs.

A few years ago I went on vacation for a week with a half-dozen friends in an Airbnb and spent the entire time miserably sick with some kind of respiratory illness. I was similarly determined not to get anyone else sick (and I was sick from the start, so avoided any asymptomatic period). I was fastidious about distancing and sanitizing, and any time I needed to cough I'd step outside of the house. Nobody else got sick. Is the sample size here large enough to determine anything? No idea, but I like the anecdote.

They seem to have perpetual runny noses when they’re really young.