Although most people are ill for only a few days, some have a much more serious illness and may need to be hospitalized. Thousands of people die each year from influenza-related illnesses.
Most deaths caused by influenza are in elderly people.
People who are at risk for getting a serious case of influenza or a complication should get the vaccine. Residents of long-term care facilities housing persons of any age with chronic mental conditions. Anyone who has had close contact with people who are at risk for getting a serious case of influenza. People in schools and colleges, to prevent outbreaks. People going to the tropics any time of the year or to countries south of the equator between April and September.