Your immune system is your body’s built-in defense network, working nonstop to protect you from bacteria, viruses, and other ...

A growing body of research suggests that what’s missing from the body may matter just as much as what viruses are circulating during flu season. A large study found that people with low levels of a ...

Here’s what doctors have to say.

Older adults vaccinated against shingles appear to experience slower biological aging, according to a new study.