At the direct-to-consumers level, think "I've fallen and I can't get up!" Automatic detection of illness and alerts for the old and infirm could be a potential market, though research on college students is not going to be at all effective for monitoring old people. And, if it can only detect trends rather than a specific individual situation, then it won't work in this context.

As others mentioned, making it a standard part of all phones might be something you could sell to governments, particularly in areas where flu frequently becomes epidemic.

It's a public health issue, which isn't usually an extremely easy to go-to-market area, I would think. Since it doesn't cure people of the flu, and doesn't help prevent it in any particular individual, it has nearly zero market value for any individual. I wouldn't even have a reason to install it for free...what good would it do me?

Is there some element of your research and tech that can be generalized to spot other kinds of trends? Trendspotting is extremely valuable, particularly to marketers...Google would probably acquire a company that can effectively trendspot from mobile devices, and even if they didn't, a mobile ad platform with trendspotting would be incredibly lucrative.