A flu episode is a period of time in which an individual experiences the symptoms of the influenza virus. The term 'BOUT' is used to describe this episode, and is defined as a period of intense activity or struggle. A BOUT of the flu can last anywhere from a few days to several weeks, depending on the severity of the infection. Symptoms of the flu include fever, chills, body aches, fatigue, and coughing. Treatment for a flu episode typically involves rest, fluids, and over-the-counter medications to reduce fever and discomfort.