A additional 2,988 instances of coronavirus have been reported in the UK in the past 24 hours, government data showed.
It is the maximum amount reported on a single day since 22 May and a rise of 1,175 on Saturday, according to the UK government's coronavirus dash.
Health Secretary Matt Hancock stated he was"concerned" about an increase in cases"mostly among young people".
Two additional deaths within 28 days of a positive test were listed, taking the entire amount of UK deaths to 41,551.
Mr Hancock added:"It's so important that everybody does their bit and follows the social distancing because it doesn't matter how old you're, how influenced you may be by this disease, it is possible to pass the illness on to others."
"So do not pass the disease on to your grandparents in case you are a young person, everybody should follow the social distancing."
Regardless of the sharp rise in cases, Mr Hancock said the government was appropriate to reopen schools"due to the impact on children of not obtaining an education", adding that offices which have reopened are"Covid-secure".
Scotland listed 208 new instances on Sunday, its highest daily increase for more than 17 weeks.
Wales listed a further 98 instances, its greatest daily increase since 30 June, and Northern Ireland recorded 106 new instances, its highest rise since 25 April.
Overall, since the start of the pandemic, 347,152 cases have been confirmed in the united kingdom.
The number of daily reported cases has been rising steadily and some of that's been put down to a increase in the amount of individuals being tested.
Put simply, the more you test the more new cases you'll find. However, the leap of more than one thousand per day is a significant new spike.
What Matt Hancock and health officials are concerned about is that the UK might follow the same route as France and Spain, where increases in infections among younger adults directed after a couple of weeks to higher numbers of admissions to hospitals for elderly and more vulnerable patients.
The number of people seriously ill in hospital using Covid-19 has fallen and there were two new daily deaths that are reported.
Medical leaders and ministers can just hope that the spread of the virus amongst younger people does not get passed to the older and those with underlying health issues.
Labour's shadow health secretary Jonathan Ashworth said ministers needed to"set out what is being done to get testing back on track and deliver down case down numbers".
He said the increase in cases came on top of"the continuing testing fiasco where sick people are advised to drive for miles for tests, and the poor performance of the contact tracing system".
Increased need led bosses in charge of the coronavirus testing method to apologise after it emerged UK labs were struggling to maintain.
How many verified instances are there in your area?
As summer ends, UK must square up to Covid again
How do I get a coronavirus test?
Prof Paul Hunter, an expert in outbreak response in the University of East Anglia, stated some of the increase may be due to the machine catching up following delays when it fought to keep up with demand, but it was still a"marked increase".
"Regrettably it's beginning to seem like we are moving into a period of exponential growth in the united kingdom epidemic, and if so we can anticipate additional gains over forthcoming weeks," he said.
Birmingham had the single biggest increase in cases instantly, and the majority of new cases were in the north of England, said Yvonne Doyle, Public Health England's health manager.
However she said no only place accounted for the overnight change, with broad increases in Covid-19 cases across England.
The rise in positive evaluations came as more demanding measures restricting household contacts were introduced in Bolton in an attempt to stop coronavirus cases rising and stop a whole local lockdown.
The disease rate in the region has risen to 99 cases per 100,000 individuals a week - the highest in England.
Commenting on Scotland's increase, First Minister Nicola Sturgeon said:"While this reflects the opening up of the market, it reminds us of their need to set up counter measures."
She added that the"first line of defence" is to"take greater care on face coverings, hygiene and space".
It is the maximum amount reported on a single day since 22 May and a rise of 1,175 on Saturday, according to the UK government's coronavirus dash.
Health Secretary Matt Hancock stated he was"concerned" about an increase in cases"mostly among young people".
Two additional deaths within 28 days of a positive test were listed, taking the entire amount of UK deaths to 41,551.
Mr Hancock added:"It's so important that everybody does their bit and follows the social distancing because it doesn't matter how old you're, how influenced you may be by this disease, it is possible to pass the illness on to others."
"So do not pass the disease on to your grandparents in case you are a young person, everybody should follow the social distancing."
Regardless of the sharp rise in cases, Mr Hancock said the government was appropriate to reopen schools"due to the impact on children of not obtaining an education", adding that offices which have reopened are"Covid-secure".
Scotland listed 208 new instances on Sunday, its highest daily increase for more than 17 weeks.
Wales listed a further 98 instances, its greatest daily increase since 30 June, and Northern Ireland recorded 106 new instances, its highest rise since 25 April.
Overall, since the start of the pandemic, 347,152 cases have been confirmed in the united kingdom.
The number of daily reported cases has been rising steadily and some of that's been put down to a increase in the amount of individuals being tested.
Put simply, the more you test the more new cases you'll find. However, the leap of more than one thousand per day is a significant new spike.
What Matt Hancock and health officials are concerned about is that the UK might follow the same route as France and Spain, where increases in infections among younger adults directed after a couple of weeks to higher numbers of admissions to hospitals for elderly and more vulnerable patients.
The number of people seriously ill in hospital using Covid-19 has fallen and there were two new daily deaths that are reported.
Medical leaders and ministers can just hope that the spread of the virus amongst younger people does not get passed to the older and those with underlying health issues.
Labour's shadow health secretary Jonathan Ashworth said ministers needed to"set out what is being done to get testing back on track and deliver down case down numbers".
He said the increase in cases came on top of"the continuing testing fiasco where sick people are advised to drive for miles for tests, and the poor performance of the contact tracing system".
Increased need led bosses in charge of the coronavirus testing method to apologise after it emerged UK labs were struggling to maintain.
How many verified instances are there in your area?
As summer ends, UK must square up to Covid again
How do I get a coronavirus test?
Prof Paul Hunter, an expert in outbreak response in the University of East Anglia, stated some of the increase may be due to the machine catching up following delays when it fought to keep up with demand, but it was still a"marked increase".
"Regrettably it's beginning to seem like we are moving into a period of exponential growth in the united kingdom epidemic, and if so we can anticipate additional gains over forthcoming weeks," he said.
Birmingham had the single biggest increase in cases instantly, and the majority of new cases were in the north of England, said Yvonne Doyle, Public Health England's health manager.
However she said no only place accounted for the overnight change, with broad increases in Covid-19 cases across England.
The rise in positive evaluations came as more demanding measures restricting household contacts were introduced in Bolton in an attempt to stop coronavirus cases rising and stop a whole local lockdown.
The disease rate in the region has risen to 99 cases per 100,000 individuals a week - the highest in England.
Commenting on Scotland's increase, First Minister Nicola Sturgeon said:"While this reflects the opening up of the market, it reminds us of their need to set up counter measures."
She added that the"first line of defence" is to"take greater care on face coverings, hygiene and space".