Influenza, also called the flu, is an infection of the upper airway caused by an influenza virus. Symptoms can include fever, headache, runny nose, sore throat or cough. Every year there is a period of time where there are more outbreaks of the flu, which is called flu season. Flu season generally occurs during the fall, winter and early spring. The influenza vaccines protect against the viruses that cause influenza. To learn more about the flu and the flu vaccines, and to access flu-related information from your health authority, visit our Influenza (Flu) Season health feature.
Author: Healthwise Staff Medical Review: E. Gregory Thompson, MD - Internal Medicine Brian O'Brien, MD, FRCPC - Internal Medicine Adam Husney, MD - Family Medicine Christine Hahn, MD - Infectious Disease, Epidemiology
Medical Review:E. Gregory Thompson, MD - Internal Medicine & Brian O'Brien, MD, FRCPC - Internal Medicine & Adam Husney, MD - Family Medicine & Christine Hahn, MD - Infectious Disease, Epidemiology