I've never heard of anti-snot rocketing either. Please explain.

I was sick recently with the flu. I don't think commuting had anything to do with it. I get sick as much as the average person. Pretty hard to avoid when you spend 40 hrs/week in an office that circulates the air you breathe with hundreds of other people. If anything, having a 3 y.o. starting pre-school has a much bigger effect.