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This site claims that this action will help prevent you getting sick during air-travel:

try applying a small amount of Neosporin or petroleum jelly just inside the nostrils (use a Q-tip if your hands aren't freshly washed).Experts say the antibacterial action of Neosporin is unlikely to present much of a barrier when used in this way, but it never hurts to moisturize the inside of the nose

Is there any validity to this claim?

Related: Can triple antibiotic ointment in the nostrils prevent flu?

  • Which claim: antibacterial or moist? – Henry Feb 18 '15 at 22:32
  • My question was specifically about the physical barrier preventing illness (especially viral illnesses). – JasonR Feb 19 '15 at 13:15

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