Public Health England has announced that a further 12 people have coronavirus in the UK.
The number of people who have the disease in the country now stands at 35.
Four of those who tested positive in the past 24 hours contracted the disease in the UK, unlike the majority of those previously infected.
A statement from Professor Chris Whitty, chief medical officer for England, said: "As of 9am this morning 12 further patients in England have tested positive for COVID-19.
"Three patients were close contacts of a known case, transmitted in the UK, identified as part of contact tracing.
"One patient, resident in Essex, had no relevant travel and it is not yet clear whether they contracted it directly or indirectly from an individual who had recently returned from abroad; investigations are ongoing.
"Of the remaining eight cases, six had recently travelled from Italy and two from Iran.
"The patients who have recently travelled are from London, West Yorkshire, Greater Manchester, Hertfordshire and Gloucestershire. All are being investigated and contact tracing has begun."
He added: "The total number of confirmed cases in England is now 33. Following previously reported confirmed cases in Northern Ireland and Wales, the total number of UK cases is 35."
The updated total comes in the days after the diagnosis of the first patient to get coronavirus in the UK without having travelled abroad recently.
The man, who is believed to be from Surrey, was the first example of human-to-human transmission of the Covid-19 strain of the disease in the UK.
As it stands, five people in the UK have coronavirus without having left the country recently.
This morning the government refused to rule out cutting off entire cities if Britain enters a worst-case scenario of coronavirus.
Health Secretary Matt Hancock said "we don't take anything off the table" as the global death toll neared 3,000 – including one Brit on a cruise ship in Japan.
The Tory Cabinet minister, who is setting up a "war room" and passing emergency laws, warned that scientists have said it is "inevitable" that the virus will become endemic in society.
Over in the Republic of Ireland Ireland's deputy chief medical officer Dr Ronan Glynn has spoken of the difficult of containing the disease.
He said the task of tracing those people who have had contact with a patient confirmed as Ireland's first case of Coronavirus is "complex".
"The process of contact tracing is a complex one, it only started less than 24 hours ago and is ongoing," Dr Glynn told RTE Radio One.
"There is a whole range of risk assessments that underpin that contact tracing process. Public health doctors commenced it last night – it's ongoing and I'm not in a position to give any more details than that.
"But what I can say is that the people, in the first instance the doctors who need to have this information, have this information.
"And they will be contacting the contacts who need to have more information.
"We are constantly striking a balance. And we have been open and transparent throughout this process about the developing situation internationally, our preparedness here, and we will continue to give more information as the situation evolves. But we have got to at all times protect the confidentiality of individual patients."
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