We often judge our immune systems based on how many colds we catch in a year, but experts say that’s an oversimplification of what is a highly complex network of cells, tissues and organs that works ...

How does the same infection, say the flu or a cold, give some people mild symptoms and leave others suffering? Why do people develop autoimmune diseases? And will we ever be able to predict when—and ...

Antibodies are best known for their ability to latch onto and neutralize bacteria, viruses and other pathogens. But these immune proteins can do more than that: They also activate other components of ...