What is bird flu and how has it spread?

There are many types of bird, or avian, flu. The type currently causing concern is the pathogenic Asian strain of the H5N1 virus.

10th February, 2007

There are many types of bird, or avian, flu. The type currently causing concern is the pathogenic Asian strain of the H5N1 virus. Scientists have discovered four different subtypes of H5N1, and there could well be more. All are deadly to birds and can cause disease and death in humans.

However, H5N1 cannot pass easily from human to human.

Of the 164 people who have died from H5N1, almost all have been...

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