Swine flu has been making headlines all over the world ever since the first case was diagnosed in Mexico, in April.
In the UK, three people who had the virus have died - although they also had other health problems - and several schools have shut because of it.
You may even know one of the 6,000 people living in the UK who've been diagnosed with swine flu. But how worried should we be about it all?
Sonali's been finding out...
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