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The answer...electricity!
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.