Let’s get this straight first… Flu is the respiratory sickness caused by the influenza virus that threatens the functions of your nose, throat and lungs.
Flu is a virus that spreads by injecting its genetic information into the nuclei of your cells. In other words, it hijacks the good cells and controls their function to turn them against you. And you get it simply by breathing it in. –The No-Nonsense, Non-Alarmist, Essential Guide to the Flu – Kicker.