Influenza can cause fever, cough, chills, headache, muscle aches, sore throat. It can lead to pneumonia and death.
Influenza can make people of any age ill.
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. The viruses that cause influenza change often, and protection declines within a year after vaccination. So people who need the vaccine should get it every year.