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Coronavirus R0: What is the R number and why does it matter?
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.
https://www.bbc.co.uk/news/av/health-52494495/coronavirus-r0-what-is-the-r-number-and-why-does-it-matter