They keep not saying SWEAT. Isn’t that a body fluid?
We all perspire some all the time don’t we? Sometimes we sweat at a rate less than the evaporation rate but we still deposit moisture on surfaces we sit on don’t we?
We perspire all the time, it just isn’t visible all the time.
I believe we need to be very careful about any sort of compromise in our skin’s integrity. If we have gum abrasions, we need to be very careful what we introduce to our mouth too.
We should keep our hands away from our face at all times. Our hands can come into contact with contaminated surfaces.
If someone chews their fingernails, they could bring contaminated skin surfaces to the mouth. Then if there is a compromised gum situation, there could be a problem.
People need to think, and take every precaution they can on a flight.