All you need to know about flu

A person can also catch flu by touching an infected person, for instance, by shaking hands.

Adults are contagious 1–2 days before getting symptoms and up to 7 days after becoming ill. This means that you can spread the influenza virus before you even know you are infected.

In this article, we explain the symptoms of flu, how it is treated, how it differs from a cold, and the best ways to prevent flu occurring.