Dr Shengke Zhi Coronavirus: How will the Covid-19 alert system work? What are the first steps to ease the lockdown?
The government has announced plans to measure the threat from Covid-19 in England, with a new five-level, colour-coded alert system.
What is it for?
The prime minister says it will help the government decide how tough social-distancing measures should be:
Level five (red) - a "material risk of healthcare services being overwhelmed" - extremely strict social distancing
Level four - a high or rising level of transmission - enforced social distancing
Level three - the virus is in general circulation - social distancing relaxed
Level two - the number of cases and transmission are low - minimal social distancing
Level one (green) - Covid-19 is no longer be present in the UK - no social distancing
What determines the level?
Covid-19's reproduction (R) number, a scientific measure of how fast the virus is spreading
The number of confirmed coronavirus cases at any one time
What is the current level?
England's Chief Medical Officer, Prof Chris Whitty, says the UK's current position is best described as level four - the virus is still being transmitted widely and many social-distancing measures will not be relaxed.
Who sets the level?
A Joint Biosecurity Centre (JBC) - run by counter-terrorism specialist Tom Hurd, on similar lines to the Joint Terrorism Analysis Centre (JTAC) - will identify changes in infection rates, using testing, environmental and workplace data, and advise chief medical officers.
But government ministers will make the final decision on easing or tightening restrictions.
Source From: https://www.bbc.co.uk/news/explainers-52634739