The first person confirmed to have coronavirus in London took an Uber to hospital and walked into an A&E department.
When the patient - a woman - "self-presented" at Lewisham Hospital on Sunday, they were immediately given a face mask and taken to a special area to be tested for the virus.
Ben Travi, chief executive of Lewisham and Greenwich NHS Trust, said the test result came back positive on Wednesday and the patient was transferred to a specialist NHS centre at Guys and St Thomas' Hospital.
All staff who came into contact with the patient have been traced, Mr Travi added, while Uber has suspended the account of the driver after liaising with Public Health England (PHE).
Two staff from Lewisham Hospital are now in isolation at home after coming into contact with the woman, believed to be a Chinese national, who flew into London from China.
"We received a request from Public Health England for information about a passenger who has now been confirmed as having coronavirus," said an Uber spokeswoman.
"Out of an abundance of caution, we temporarily suspended the account of the driver who transported the individual to hospital and we remain in close contact with Public Health England.
"We have a dedicated online portal for public health authorities to contact Uber for information about riders and drivers, and we will take action on any user accounts on the recommendation of those authorities."
PHE consultant Rachel Thorn said: "We are in contact with Uber to ensure the driver receives advice and information on what to do should they feel unwell in the coming days.
"As the journey was less than 15 minutes, the driver did not have close sustained contact with the individual and are not considered high risk."
In other developments:
A man in a hazmat suit and face mask has also been seen cleaning surfaces in the patient waiting area of a health centre in north London, although no confirmed or suspected cases have been linked to the site.
The picture was taken from outside Ritchie Street Group Practice in Islington on Thursday.
On the entrance, a sign said it was closed "due to operational difficulties".
Dr Robin Thompson of Oxford University issued a warning about how the London Underground could become a hotbed for the illness - although it came before travel details emerged about the first confirmed case in the capital.
He said: "In general, if an initial case is in a densely populated area, then the risk of sustained person-to-person transmission following is higher.
"This is exacerbated by the fact that London is a transport hub, and the Underground could provide a network to spread the virus quickly. As a result, given this case was in London, it might be expected that there is an increased risk posed by this case compared to the others we have seen."
Regarding face masks, the British Dental Association (BDA) has said it has been inundated with calls from member practices in the wake of "panic buying, clumsy rationing and naked profiteering".
China is the world's leading manufacturer of sanitary masks, and some suppliers have tripled prices since January.
The BDA estimates a single surgery in a typical NHS practice - seeing around 28 patients per day - gets through five boxes of masks, containing 50 masks in each, a week.
It said practices are now finding they are unable to order more than two boxes per day, leaving bigger practices across the country facing a shortage.
Chairman Mick Armstrong said dentists had fallen victim to "panic buying, clumsy rationing and naked profiteering".
In England, dentists are required to wear disposable face masks, clinical gloves, household gloves, plastic disposable aprons, and eye protection, and in Scotland can use disposable masks or reusable visors interchangeably.
The outbreak is continuing to have an impact on UK businesses, with British Airways halving its number of flights between Heathrow and Hong Kong due to a drop in demand.
JCB is set to reduce production levels at UK factories due to anticipated component shortages from Chinese suppliers, meaning a shorter working week for around 4,000 JCB and agency shop floor employees from Monday.
The measures were discussed with the GMB union and will see the introduction of a 34-hour week for UK production employees until further notice, with JCB employees to be paid for a 39-hour week and will bank the hours.