If people expect their fellow passengers to be be germless, they'd better set up clinics at the airport checkpoints. Add another thousand or so to the ticket price. Hose those biohazards down. This is a ridiculous expectation to cultivate. An airplane is a nasty place to be, which is why I avoid them, period. I've always had a splitting headache when I get off due to the funny air.
There's no place worth going that is worth the beastly experience of getting there.
If the rich, restless, and self-indulgent must get their bragging rights, they'll bring home pathogens. And a lot more travel amateurs than medical conference attendees do this. Go pick on *them*. But your notions of what can be screened at an airport are naive.