Just got over an upper respiratory illness contracted after a 11 hr flight (coach, if that makes any difference?), but now my wife has it.

I am healthy but get such illnesses about one international flight in five.

Any ideas to reduce the risk? already wash hands frequently. Fly business? A doctor friend says wearing a face mask makes no difference unless it is HEPA compliant. A holistic friend says you can take immunostimulants.

found this, but of little value

https://www.cdc.gov/quarantine/air/m...abin-crew.html