Last updated: 28 april, 2009 - 09:59 GMT
World on flu alert as swine virus spreads
The UK has enough anti-viral drugs to treat half its population
More than 100 people have now died of a new strain of swine flu in Mexico as officials around the world start planning for what they say could turn into a pandemic.
One case has now been confirmed in Spain, the first confirmed case in Europe, and there have also been cases confirmed in the United States and Canada.
In Mexico, the population has been advised to stay indoors, wear breathing masks and not to mix in public spaces.
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Just how dangerous is this strain of swine flu?
Dr Robert Webster is one of the world's leading virologists.
He helped governments deal with the bird flu scare a few years ago and he is a director of one of the centres of excellence for influenza research in the US:
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First broadcast 27 April 2009
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