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What causes the flu?

The flu is caused by an influenza virus. The virus can evolve rapidly, developing into new strains on a regular basis.

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About this article

Author: Dr Joanne Van der Velden PhD, BSc (Hons)
First answered: 18 Sep 2014
Last reviewed: 19 May 2018
Rating: 4.7 out of 5
Votes: 1077 (Click smiley face below to rate)
Category: Bronchitis


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