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Bang on TV
We have got used to hearing scare stories about strange strains of flu with names like H1N1, but is there any real danger? Jem Stansfield explains flu on a cellular level, showing how it can mutate from a cause of winter snuffles to a virus capable of killing millions.
Liz Bonnin witnesses the vaccines being made that will protect us next winter. Maggie Philbin visits a lab where healthy patients are infected with flu, and witnesses exactly how it attacks.