The flu, like a cold, is a respiratory infection but is caused by an entirely different group of viruses - namely the influenza A, B and C viruses. Perhaps the best way to prevent the flu is to get an annual flu shot before the flu season hits.
I called Lufthansa, and they told me that there are Economy Plus seating sections on the Bangalore to Frankfurt and Frankfurt to Chicago legs. But, since I bought tickets through United, they told me I can't get any seat assignments until check-in in Bangalore unless I work with United.
Lufthansa - Dear Customer Service Manager: I am writing. Dear Customer Service Manager: I am writing these letters in reference to our scheduled flight on May 3, 2015. For your reference our booking code is PNRZYKB8Q. My miles and more card number is 9920 0106 0902 572.