Michael Head, a global health expert from the University of Southampton said that of the 1,750 tests carried out so far in the United Kingdom, more than 99 per cent had turned out to be negative.
New cases in worst-hit Chinese city Wuhan - where the virus began - could peak by the end of the month, experts say.
During a press conference on Tuesday, WHO director-general Tedros Adhanom Ghebreyesus said China's effort to contain the virus was the reason there have been so few global cases.
Meanwhile, all 83 people being held in quarantine at Arrowe Park Hospital in the Wirral have been told their final set of test results for the coronavirus have come back negative, confirming they are free of the virus.
"This is exacerbated by the fact that London is a transport hub, and the underground could provide a network to spread the virus quickly", Thomson said.
"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".
A confirmed case of the new coronavirus in London raised concerns that the city's mass transit system could help the virus spread.
But more cases here are "highly likely".
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Four other people confirmed to be infected are all understood to be contacts of a businessman who was diagnosed in Brighton last week after contracting the virus in Singapore.
"I would like to thank the clinical team who treated Mr Walsh in hospital, as well as all the NHS staff who are working hard with other health organisations to limit the spread of coronavirus and treat the small numbers who have contracted the illness".
Officials know that the pair worked at a nursing home, Worthing Hospital A&E and two GP practices between them.
On Wednesday, there was a sharp increase in the number of new cases diagnosed in Wuhan and the surrounding province, Hubei, with a total of 60,000 infections and 1,350 deaths across China.
He said what happens with coronavirus - also known as Covid-19 - could go one of two ways, with the first scenario seeing the Chinese government getting on top of the epidemic and then a limited impact on the rest of the world.
There's now no vaccine for coronavirus, but there are things you can do to help stop germs like coronavirus spreading.
The World Health Organisation (WHO) cautioned that while the number of newly confirmed cases reported in China has stabilised, it remains a threat. The vast majority of infections and deaths have been on mainland China.