what is a flu
What is flu? Flu, short for influenza, is a virus that is easily spread by the coughs and sneezes of people who have flu. Flu is more common in autumn and winter - from October to early spring - which is why it is called seasonal flu. Flu viruses attack the body though the respiratory tract.
What's the Flu? Influenza (say: in-floo-EN-zah) is also called the flu. It's an infection that causes a fever, chills, cough, body aches, headaches, and sometimes earaches or sinus problems. The flu is caused by the influenza virus (say: VY-rus).