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How is Covid -19 spread? Who is most at risk and what are the circumstances under which it is most likely to be transmitted? These questions need answers for the implementation of effective and safe strategies to end lockdown. We look at what research is showing.

And if you have to go back to work what鈥檚 the best way to protect yourself, how should we be using face coverings for example? There are lessons from research on fluid dynamics.

Also key is reducing the rate of infection, the R number, Italy relaxed lockdown a few weeks ago we look at early findings on the impact.

It鈥檚 clear more widespread and effective testing will be needed to reduce transmission, A new test which should be quicker has been developed using synthetic biology and gene editing techniques.

(Image: Commuters wear masks whilst travelling on a London Underground train. Credit: Tolga Akmen/Getty Images)

Presenter: Roland Pease
Producer: Julian Siddle