You are watching Preview - The Hidden Invaders

 In Brazil, millions of people are infected with intestinal worms. Although there are effective drugs to treat worm infections, they’re not universally available and can’t prevent future infections. Now a team of scientists are trying to develop a vaccine against one of the most damaging parasites, hookworm. It will be the first vaccine against a multi-cellular organism.

• On site 10 February 2009
• Produced for BBC World

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