Flu in Adults
Flu in Adults Overview
Influenza (flu) is an acute infection of the nose, throat, and lungs. It is a common cause of acute respiratory illness and can affect people of all ages. It occurs every year beginning in late fall, with the peak season for the flu in the northern hemisphere extending from November through March. It infects in a widespread fashion, affecting people of different ages at the same time.
Medically Reviewed by a Doctor on 4/2/2015
Steven Fine, MD, PhD
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Influenza virus infection, one of the most common infectious diseases, is a highly contagious airborne disease that causes an acute febrile illness and results in variable degrees of systemic symptoms, ranging from mild fatigue to respiratory failure and death.