As Oxford University take a huge step forward in the hunt for an effective vaccine against Covid-19, Devi Sridhar, Professor of Global Public Health at Edinburgh University, joins Christiane Amanpour to explain how coronavirus can cause long term damage, even for young people with no underlying health conditions, and why countries across the world must prepare for winter. Then Maryland Governor Larry Hogan warns that testing shortages could make the situation even worse. Our Walter Isaacson speaks to the Mayor of Atlanta Keisha Lance Bottoms, who is also reportedly on Joe Biden's short list for presidential running mates about the heated mask debate in the United States, and why she opposes defunding the police. And finally, we tell you about the massive sperm whale trapped in an illegal fishing net and the valiant efforts the Italian coastguard are doing to free it.

To learn more about how CNN protects listener privacy, visit cnn.com/privacy