From Ebola to swine flu to HIV/Aids, viruses borne by animals have caused some of the most devastating epidemics in history. What will come next? In Sierra Leone, Joe Shute (a reporter with The Telegraph) joins PREDICT scientists working to find Disease X – a virus that is as yet undiscovered, but which could have the potential to ravage populations. 

Read feature story from The Telegraph with photo essay by Simon Townsley.