Coronavirus cases in the UK have jumped over the past seven days from 590 on March 12 to 3,269 on March 19 – a more than fivefold increase.
The spread of the virus around the UK has not been consistent, however.
In England, the sharpest rises have been concentrated mostly in London boroughs and in counties across the South East.
As of March 12, no local authority area in England had recorded more than 20 cases of the virus, with Kensington & Chelsea (19), Hertfordshire (18), Oxfordshire (17) and Hampshire (15) topping the list.
By March 19, Hampshire had jumped from 15 to 87 (the highest number for any area in England) and Hertfordshire from 18 to 52.
In London, cases in Kensington & Chelsea had risen from 19 to 57 – but this had been overtaken by five other London boroughs, where the virus now seems to be spreading rapidly.
These are Southwark (up from 11 cases to 82), Lambeth (from seven to 81), Westminster (12 to 78), Wandsworth (seven to 75) and Brent (three to 66).
London currently accounts for eight of the top 10 local authority areas in England with the highest number of recorded cases.
In Scotland, where cases are reported by local NHS health board, the highest number of cases on March 12 was in Lothian (11), followed by Greater Glasgow & Clyde (10) and Lanarkshire (seven).
These three areas still topped the list seven days later, but with a much steeper rise in Greater Glasgow & Clyde (up to 71) than in Lothian (35) and Lanarkshire (33).
Cases have now spread to all areas of mainland Scotland, with only Orkney and the Western Isles continuing to record zero cases.
Total cases in Scotland have risen from 60 on March 12 to 266 on March 19.
Wales has changed the way it reports cases in the past week, meaning a localised comparison over the past seven days is not possible.
But total cases for Wales have gone up from 25 on March 12 to 170 on March 19.
And in Northern Ireland, which currently does not publish a local breakdown of recorded cases, the number has risen from 20 on March 12 to 77 on March 19.