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OB Sisay was at the heart of Sierra Leone's response to the Ebola outbreak from 2014-2016. Here he tells us about the importance of contact tracing, and what lessons they learnt during that time which can be applied to the current coronavirus pandemic, hightlighting the difference between the two viruses. He was speaking to Bola Mosuro. (Picture: A woman talks to a health official in South Africa. Credit: Getty Images)