In the daily briefing earlier this week, Prime Minister Boris Johnson said to avoid the "disaster" of a second peak the UK must keep the R rate below one.
But what is the R number and why does it matter?
BBC health correspondent Laura Foster explains what governments are aiming for and why it matters.
Video by Terry Saunders, Laura Foster and Tobias Chapple
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May 02, 2020 at 06:59PM
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Coronavirus R0: What is the R number and why does it matter? - BBC News
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