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Scientists have named three relatively little-known diseases they think could cause the next global health emergency. A coalition of governments and charities has committed $460m to speed up vaccine development for Mers, Lassa fever and Nipah virus. Tulip Mazumdar visited the Jenner Institute where scientists are developing vaccines for all three of the viruses. Their Mers (Middle East Respiratory Syndrome) vaccine is at the most advanced stage. It is expected that it will be trialled in humans by the end of the year.