(presented here in Script-O-Vision)

Woman 1: You realize that there are more bacteria on a refrigerator door handle than on your toilet
Woman 2: That just makes me want to put paper seat protectors on my refrigerator

I've trained myself to scratch my nose using the back of my wrist while I'm out and about. As soon as I get home, I do a complete Nellie Nice Nurse handwashing. I don't catch things very often since I started to do that. Someone has to sneeze close to me and fill the air with microdroplets.

Sneeze into your elbows, people. Mythbusters did that one and it's the only thing that stops the spray.

direct the overhead air at you face. When traveling one, the passenger in the seat next to me was coughing and sneezing heavily. Sometimes using a soggy paper towel or his hand or just not bothering. I never did get sick.

so if there were other sick folks on the plane, you were maximizing your chances of having bugs blown into your face.

I'm glad you didn't get sick that time, though. It was likely a bug you'd already had at some point in your life.

It is filtered and supplemented with outside air. Without the outside air, the CO₂ would get too high and the O₂ levels would plummet after a short time.
In any case, it is much cleaner than the germ factory next to me.

Wash hands BEFORE picking nose.