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The H5N1 strain of avian flu isn't new. It was discovered in China in 1996. But in recent years it's started passing from mammal to mammal and it's now rife on cattle farms in the United States. How much should humans worry?
David Aaronovitch speaks to:
Professor Wendy Barclay, action medical research chair in virology at Imperial College London
Production team: Sally Abrahams, Kirsteen Knight and Ben Carter
By BBC Radio 44.8
5353 ratings
The H5N1 strain of avian flu isn't new. It was discovered in China in 1996. But in recent years it's started passing from mammal to mammal and it's now rife on cattle farms in the United States. How much should humans worry?
David Aaronovitch speaks to:
Professor Wendy Barclay, action medical research chair in virology at Imperial College London
Production team: Sally Abrahams, Kirsteen Knight and Ben Carter

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