As the flu season and the threat of avian flu comes closer, Professor John Oxford from the Royal London Hospital discusses what the flu is, where it comes from and whether drugs and vaccines can help, Professor Pat Troop, Chief Executive of the Health Protection Agency, describes the systems in place to stop an avian flu outbreak from spreading, and Dr Paul Digard from the Division of Virology at the University of Cambridge tells us how the flu virus escapes past layers of snot. In the Naked Scientist's Laboratory this week, Dave and Derek give us the run down on what snot is for. Listen Now
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