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Despite incredible efforts by scientists around the world, there is still much we do not understand about Covid-19. So what exactly do we still not know and understand about the virus?

Why are some people more susceptible to Covid-19 than others? Will a second wave happen? If so, when and will it look like the first? What will eventually make up the vaccine that defeats the virus?

Health Correspondent Deb Cohen takes a look at the unknowns and plies together the questions that remain.

In the studio, Emily Maitlis is joined by SAGE member and LSHTM Professor Graham Medley.