You are watching TB Vaccine

TB is a moving target. It’s a complex, mutating virus that is appearing in hundreds of different, drug-resistant strains. There are 16 different vaccines now undergoing trials – but how will we know which will quickly be made ineffective by TB’s extraordinary ability to change itself? After meeting a sufferer in London we journey to the TB frontline in South Africa.

• On site 07 September 2008
• Produced for BBC World

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