This is the theme for a game a friend of mine has made for a competition, called "Viral 0". It is a top-down shooter set in a human body, and you have to shoot viruses.
Here is a link to the game if you care to try it: http://ludumdare.com/compo/ludum-dare-31/?action=preview&uid=47548
I hope you like the song, and the game!
Please contact me if you would like to use this in a project. We can discuss the details.