Professor John Oxford, one of the world’s leading virologists, looks at how the 1918-19 flu pandemic affected every corner of the world. Over 50 million people died in the three outbreaks which hit in 1918 and 1919. It is one of the most devastating pandemics in history and to this day scientists are still trying to pin point its origins in the hope of learning lessons for fighting such catastrophic epidemics in the future.