That which does not kill you makes you stronger.
The airlines doing something proactive - HAHAHAHA. Every time I get one of those little wash towels I use them to wipe the grime off the arm rests and tray table. You think the airlines are doing to actually try to make a plane germ free - HAHAHAHAHA.
IMHO society has germophobia much all brought about companies trying hoc disinfectants so they make you think there is an issue when there is really not. Just because there is a germ present does not make it an issue.
As for flu vaccinations, meh the last I read was they are 58% effective. A waste of time and money unless one has a compromised immune system.
If you want hedge your bets, eat healthy, get some exercise, and get a good night's sleep.