Very few humans have gone up against bird flu. But we've all dealt with seasonal flu for years. Some of our immune systems ...

Measles is unlike other childhood viruses. In severe cases, it can cause pneumonia. About 1 in 1,000 patients develops ...

When the body faces harmful invaders, such as a virus or a splinter in the finger, it launches an attack to destroy the pathogens. People are born with some types of immunity, but exposure to ...

Older adults who were exposed to seasonal flu viruses that circulated prior to 1968 are more likely to have some protection ...

Most people think of viruses as small living things that bring on a nasty summer cold. But you might be surprised to learn that some viruses can lead to cancer. Keep in mind that even if you're ...