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The flu (influenza): Causes, symptoms and treatment

The flu (short for influenza) is a viral respiratory disease that affects the throat, nose and lungs. There are different types of influenza viruses, and they evolve from year to year.

For most people, the flu is an inconvenience that subsides in a few days. For others, influenza can lead to health complications, hospital visits and even death. Globally, there are an estimated 1 billion cases of flu each year, and 3 million to 5 million of these cases are severe, leading to about 290,000 to 650,000 deaths annually, according to the World Health Organization (WHO) (opens in new tab).

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