I came across this website on StumbleUpon. It has tonnes of intricate 3D animations of processes occurring inside the human body. This one in particular depicts the infection of the H1N1 virus to a human host.
The video goes on to explain how scientists have used a process known as Gene Trapping which involves infecting cells with various retroviruses to select suitable drug targets that can be used to combat viral replication and invasion.
Check out the link above if you’re interested.