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".
The UK health authorities assess that the number of confirmed cases in the country is highly likely to increase.
While the patient has now been quarantined, Dr Thompson says the risk of the virus spreading depends on the woman's interactions prior to being placed in isolation.
A rapid spread of the disease is a major concern for the NHS which reportedly can only test a maximum of 1,000 patients in a day.
"This virus was passed on in China and the patient has now been transferred to a specialist NHS centre at Guy's and St Thomas' in London", England's chief medical officer, Professor Chris Whitty, confirmed in a statement on Wednesday.More news: Marvel's Avengers 'Earth's Mightiest Edition' and Pre-Order Incentives Unveiled
Yesterday early morning paramedics in hazmat matches showed up to a level in Paddington, main London, after an individual reported signs.
In a nine-minute message broadcast to the nation, prime minister Lee Hsien Loong said: 'Fear can do more harm than the virus itself'. What does it stand for?
Official suggestions from PHE states that anybody that presumes they have coronavirus ought to remain at residence, phone call NHS 111 as well as wait for transportation to the local healthcare facility evaluation vessel.
Across Britain, 2,512 people have been tested since last month. Patients with thought coronavirus have actually swabs taken of their nose as well as throat which are sent out to among 12 laboratories throughout the UK.
The first coronavirus patient in London travelled in an Uber to turn up unannounced at A&E department of a hospital.
He was the third case of the virus to be confirmed in the United Kingdom, following two Chinese nationals testing positive in York.More news: Can Egypt Compel Mohamed Salah To Play At The Olympic Games?
They received a letter from Public Health England telling anyone with symptoms to self-isolate and contact the National health Services (NHS) helpline.
She did not come into contact with other patients and two staff members have been asked to stay home for a period of 14 days, according to The Guardian.
The Uber driver's account is now suspended.
"Our colleagues in our emergency departments are following the latest advice and protocols from Public Health England".
One of UK's coronavirus patients attended a conference in central London alongside more than 200 delegates, it has been reported.More news: Harrison Ford Says Indiana Jones 5 Starts Shooting Very Soon