Influenza, commonly known as "the flu," is a viral infection of the respiratory tract that affects the nose, throat, and sometimes lungs.
tend to happen annually, at about the same time every year. This period is commonly referred .
However, each outbreak may be caused by a different subtype or strain of the virus, so a different flu vaccine is needed to prevent the flu each year.
For most people, a bout of flu is an unpleasant but short-lived illness.
For others, however, flu can pose serious health risks, particularly if complications such as pneumonia develop.
Every year, thousands of Americans die from the flu. According to the Centers for Disease Control and Prevention (CDC), the number of deaths caused annually by flu in the United States ranged from 3,000 to 49,000 between 1976 and 2006, with an annual average of 23,607 flu-related deaths.
The best way to avoid getting the flu is to get an annual flu vaccination, encourage the people you live and work with to do likewise, stay away from people who are sick, and wash your hands frequently.