Infections play out like short wars. A virus enters the body and over time the immune system’s T-cells respond and kill off infected cells. How do we know this? Well, because researchers have developed a way to watch all of this happen in real time. Using a new technology, researchers can create imaging of a virus traveling in the body. It’s helping researchers fully understand how the immune system, and it could lead to more effective treatments that trigger swifter, softer immune responses.