Influenza

From Wikipedia, a free encyclopedia written in simple English for easy reading.

Influenza (or the flu, the grippe) is a very common disease. It is contagious, so it passes from one person to another very easily. Usually, it spreads around the world in seasonal epidemics. In the 20th century, there were three big epidemics (called pandemics) that killed millions of people.

The disease affects the upper airways and the lungs, what doctors call the respiratory tract.

There is a vaccine against influenza.

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