Flu is a contagious respiratory illness caused by influenza viruses that infect the nose, throat, and sometimes the lungs. It can cause mild to severe illness, and at times can lead to death.
The best way to prevent seasonal flu is to get vaccinated every year. Everyone 6 months of age and older should get a flu vaccine every season, especially people at high risk. It is also recommended to practice good hand hygiene and stay home when you are ill.