New research shows feverish temperatures make it more difficult for viruses to hijack our cells. A mouse study suggests it's the heat itself that makes the difference.

We all get sick sometimes. Even something pretty minor, like a cold or flu, can be enough to disrupt your life for a few days. When you have a minor illness, it does more than just make you feel ...

Every day, your immune system performs a delicate balancing act, defending you from thousands of pathogens that cause disease while sparing your body's own healthy cells. This careful equilibrium is ...