Influenza, commonly known as the flu, is very common. Millions of Canadians get the flu every year. It is a viral infection that spreads from person-to-person through coughing, sneezing or even just talking. The flu can cause fever and chills, sore throat, muscle aches, fatigue, cough, headache, and runny or stuffy nose.
Unlike many other viruses, influenza changes quickly. This means vaccinations must be updated annually to match common flu strains in circulation.