The UK has recorded its highest number of new cases since the coronavirus pandemic began.
Officials said a total of 6,634 new coronavirus cases were recorded on Thursday.
Yvonne Doyle, Medical Director at Public Health England, called the rise a "stark warning".
Experts have previously warned that describing the daily figure as a record could be “misleading” as it is not clear how many people were actually infected during the height of the first wave due to a lack of community testing at the time.
The Government also said a further 40 people had died within 28 days of testing positive for Covid-19 as of Thursday. This brings the UK total to 41,902.
Separate figures published by the UK’s statistics agencies show there have now been 57,600 deaths registered in the UK where Covid-19 was mentioned on the death certificate.
Ms Doyle said positivity was rising across all age groups.
“This is the highest number recorded and a stark warning for us all", she said.
"The signals are clear. Positivity rates are rising across all age groups and we’re continuing to see spikes in rates of admission to hospital and critical care.
“We must all follow the new measures that have been bought in to help control the virus and download the new NHS Covid-19 App which is the fastest way of knowing when you’re at risk.”
It comes as Chancellor Rishi Sunak admitted that a multibillion-pound package of support for the economy may not be enough to prevent rising unemployment and businesses going to the wall.
The resurgence of coronavirus poses a threat to the UK’s “fragile” economic recovery, the Chancellor said as he confirmed plans for the state to top up the wages of workers forced to cut their hours due to the pandemic.
The Job Support Scheme was aimed at protecting “viable” roles once the furlough scheme comes to an end, with Mr Sunak arguing it would be “fundamentally wrong” for people to be kept in jobs that can only exist due to state funding.
Other measures included in the package include an extension of the VAT cut for tourism and hospitality and more flexible terms for the repayment of Government-backed loans.