Bird flu may not have become the threat to humans that some predicted because our noses are too cold for the virus to thrive, say UK researchers.

An Imperial College London recreation of the nose's environment found that at 32 degrees Celsius, avian flu viruses lose function and cannot spread.
It is likely that the viruses have adapted to suit the warmer 40 degree environments in the guts of birds.
A mutation would be needed before bird flu became a human problem, they said.

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