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.
Fortunately, United miles provide an opportunity to take part in this amazing experience. For 110,000 miles you can book a one-way first class award flight on Lufthansa. This is not the cheapest mileage cost to get to Europe, or even to fly Lufthansa first class, but United does not pass on fuel surcharges to you.