The commonest symptoms are: rapid onset of fever, shivering, headache, muscle aches, and a cough. Flu causes a much more severe illness than the common cold: a cold doesn’t cause fever or muscle aches. People with flu can feel very ill indeed, often resulting in several days of being confined to bed. Most people recover easily, but would have much preferred to avoid the experience altogether, which is where flu vaccine comes in. For some victims, flu can cause more serious complications, like bronchitis and pneumonia – potentially life-threatening in the elderly, asthmatics and those with pre-existing medical conditions.
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