a great tip for flying and trying to reduce catching airborne germs is to lightlyu swab the inside of yoru nose w/ neosporin ointment
...except that the main antibacterial agent in Neosporin (neomycin) is toxic if it gets in your bloodstream, and applying to a mucous membrane (like inside your nose) where it can be more readily absorbed into your bloodstream is a bad idea.
Horrible advice IMO. Don't do it.