Recent weeks in the UK, according to new estimates.
The government’s latest R number is between 1 and 1.2, which means the epidemic is growing.
And a study of thousands of people in England found cases doubling every seven to eight days, with a marked rise in the north and among young people.
New laws on how many people can socialise indoors and outdoors are being introduced from Monday.
The ‘rule of six’ will ban gatherings of more than six people indoors in England, Scotland, Wales and Northern Ireland.
It has also been announced that Birmingham will become the latest area to bring in new restrictions after a spike in cases.
But three separate large studies have indicated a widespread resurgence of coronavirus across the population.
And the R (reproduction) number – which describes how many others each infected person passes the virus on to – has also increase
If it is higher than one, as now, numbers infected are growing.
But the virus is still at much lower levels across the UK than at the peak of the pandemic in April.