Britannica School offers a huge range of accurate and up-to-date content to help you with your research, including articles, photos, videos and primary sources.
NF 537 ELE
Image source: Lester Lefkowitz/Corbis via Encylopedia Britannica
Flu (influenza) - Better Health Channel
Influenza (the flu) is caused by a virus. Symptoms include high fever, sore throat, weakness, headache, muscle and joint pains and a cough. Treatment includes bed rest and drinking plenty of fluids. Vulnerable people are more likely to develop serious complications including pneumonia. Immunisation can offer protection from flu.