The flu vaccine isn't like other vaccines with longer-lasting protection. Even if you had a flu shot last season, you will need a flu shot each year to be protected. Flu viruses are unpredictable, and every season puts you at risk.
Anyone can become sick with the flu and experience serious complications. Older adults, infants, pregnant women and people with medical conditions like asthma, diabetes, heart disease, or kidney disease are at especially high risk from the flu. However, kids, teens and adults who are active and healthy also can get the flu and become very ill from it.