From the Daily Mail:
A deadly strain of bird flu previously unknown in people has begun to mutate into a form more likely to cause a human pandemic, scientists say.
Just days after authorities in China announced they had identified cases of H7N9, flu experts in laboratories across the world are picking through the DNA sequence data of samples isolated from patients to assess its severity.
One of the world’s top flu experts, Ab Osterhaus, from the Erasmus Medical Centre in The Netherlands, says the sequences show some genetic mutations that should put authorities on alert and entail increased surveillance in animals and humans.
'The virus has to a certain extent already adapted to mammalian species and to humans."
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