The flu isn’t always thought of as a serious or life-threatening illness. Because of the dangers and complications it can have in older people, children, and people with health problems, the perception of flu severity is changing.
In the U.S., an estimated 25–50 million cases of the flu are currently reported each year — leading to 150,000 hospitalizations and 30,000–40,000 deaths yearly. If these figures were to be estimated incorporating the rest of the world, there would be an average of approximately 1 billion cases of flu, around 3–5 million cases of severe illness, and 300,000–500,000 deaths annually.
Flu-related deaths can result from pneumonia and from exacerbations of cardiopulmonary conditions and other chronic diseases. Deaths of older adults account for more than 90% of deaths attributed to pneumonia and influenza.