Each winter, millions of people suffer from influenza—the flu. The flu virus infects the nose, throat, and lungs, and spreads from person to person through coughs and sneezes. The video explains why a flu shot is important to help prevent this illness, which can be life-threatening in older adults.
The flu (influenza) is a viral illness that affects the air passages of your lungs. It's different from the common cold. Learn how to care for yourself when you have this condition.
