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Ruth Alexander asks whether airport screenings for Ebola are really an effective way of stopping transmission of the disease. And as the United Nations asks for another $1billion (£625million) in aid we take a look at which governments and charities are rallying to the cause and which are not. The programme hears from David Mabey, Professor of Communicable Diseases at the London School of Hygiene and Tropical Medicine and Dr Kamran Khan, an infectious disease physician at St Michael’s Hospital in Toronto. (Image: An employee of the airport emergency medical service presents an information note on the Ebola virus and an electronic thermometer on October 17, 2014 at the Roissy-Charles-de-Gaulle airport in Roissy-en-France. Credit: KENZO TRIBOUILLARD/AFP/Getty Images)