It is a bad time to be a parasitic worm or tsetse fly. An unprecedented $785 million is to be invested by governments of rich countries, pharmaceutical companies and global charities to try to combat tropical diseases affecting a billion of the world's poorest people. The collaboration has pledged this week to provide 14 billion treatments over the next decade for 10 neglected tropical diseases, including sleeping sickness, spread by the tsetse fly, leprosy and a host of debilitating diseases caused by parasitic worms.
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