I have had both the seasonal flu shot and the H1N1 shot, so I feel a little safer, but there are a lot of strains of flu floating around.
Maybe they should start serving "Jewish penicillin" aka My moms Kosher chicken soup on board.
Seriously, I assumed the FAs know about universal precautions, as I do, being in the healthcare field. I'd prolly suggest the person with the illness wear a mask and
if possible sit alone. Best case: fly when well.