Marburg virus cases confirmed

As Marburg virus cases are confirmed in Ghana, Dr Graham Easton discusses the importance of a swift response. BBC Africa correspondent Charles Mgbolu reports from Nigeria on the relationship between monkeypox emergence and smallpox eradication. Plus Claudia hears good news from Dr Jaekeun Park at the University of Maryland about progress on making a universal flu vaccine.Presenter: Claudia Hammond Producer: Erika Wright(Picture: Marburg virus, cut-away illustration. Photo credit: Roger Harris/Science Photo Library/Getty Images.)