Swine flu: what is the H1N1 virus and how is it spread?

As India battles to contain one of its worst swine flu outbreaks, doctors urge people to protect themselves

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India is currently struggling to contain its deadliest swine flu outbreak since 2010, with the infection killing more than 900 people so far. The H1N1 virus was responsible for a global pandemic in 2009, which originated in Mexico and the US. One in five people were infected, according to figures from 19 countries, and more than 200,000 people died worldwide.

What is swine flu and how is it spread?

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