Four new cases of coronavirus have been diagnosed in England, bringing the total to 13, the Chief Medical Officer has announced.
The patients had been passengers on the Diamond Princess Cruise ship which had been quarantined off the coast of Japan, Prof Chris Whitty said on Sunday.
They had been quarantined at Arrowe Park hospital in Wirral, but will now being transferred to separate specialist NHS facilities.
The patients returned to the UK on board a flight carrying 30 Britons and two Irish citizens, which landed at the Boscombe Down military base in Wiltshire on Saturday morning.
The Department of Health and Social Care said a full infectious disease risk assessment had been carried out before the flight and that no one was allowed to board the flight if they displayed any symptoms of coronavirus.
“Four further patients in England have tested positive for COVID-19, bringing the total number of cases in the UK to 13," said Prof Whitty.
“The virus was passed on in the Diamond Princess cruise ship and the patients are being transferred from Arrowe Park to specialist NHS infection centres.”
Any more passengers who test positive will immediately be taken into specialist NHS care, the department said.
It added that "appropriate arrangements" are in place at Arrowe Park, including strict separation of passengers from staff and from each other.
It is understood some British nationals who are part of the Diamond Princess crew opted to remain on the ship.
Almost one-fifth of the 3,711 passengers originally on board the cruise liner have been infected.
Japan's health ministry announced on Sunday that one of the passengers taken to hospital after testing positive for the virus has died. The death of the Japanese man aged in his eighties brings the number of fatalities from the Diamond Princess to three.
Passengers 'very much in the dark'
The British couple David and Sally Abel, from Northamptonshire, who were on the cruise for their 50th wedding anniversary, are still in a Japanese hospital after being diagnosed with coronavirus and pneumonia.
Relatives said the couple are both "having a really tough time" and feel "very much in the dark" in terms of treatment, adding that they are awaiting further tests.
Speaking in a liveblog on Sunday, their daughter-in-law Roberta Abel said: "We want to get them discharged from the hospital and back to the UK as negative.
"They are scared. They said to us today, 'If we get that virus again, we are not coming home'."
Quarantined patients released
The development comes as 118 people were released from a coronavirus quarantine centre in Milton Keynes.
The group - who had been brought back to Britain earlier this month on a repatriation flight from Wuhan - spent 14 days at the Kents Hill Park training and conference centre.
They were allowed to leave on Sunday, having all tested negative for the virus.
One of the group, which included around 10 children and a family of four, said it was a "fantastic" feeling to be able to go home.
Paul Walkinshaw, from Manchester, left with his wife Lihong, having been on holiday visiting her parents in the city of Shiyan for the Chinese New Year when family members contacted them and told them about the virus outbreak.
Speaking to reporters as he exited the centre, he said: "It feels fantastic to leave, although it feels weird not having to wear a mask and gloves in public.
"The first 48 hours were hard when we were confined to our rooms, after that it was fine."
The 39-year-old praised "friendly" staff and the local community for their support and said he was looking forward to sleeping in his own bed again.
"The first thing I'm going to do when I get home is sleep in my own bed."
Another evacuee, whose name was given as Sadiqi, said they had been looked after "brilliantly".
"It was definitely hard at first (inside the quarantine) but it is just what it is. It was just one of those things."
The training and conference centre has been professionally cleaned and will be back to business as usual from next week, NHS England said.
Health Secretary Matt Hancock commended the evacuees "for their patience and perseverance", and NHS strategic incident director Professor Keith Willett thanked them for "the very responsible compliance they have shown".