The latest patient, who is being treated at Guy's and St Thomas' Hospital, is believed to be a woman who flew into London from China. And there are fears the spread of the killer bug could be exacerbated in the capital due to its status as a transport hub.
There have been more than 44,700 cases of the virus in China, with more than 1,100 deaths.
Dr Robin Thompson of Oxford University 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".
The U.K.'s most recent patient contracted the virus while in China and Professor Paul Cosford, director for Health Protection and medical director for Public Health England, told BBC they expect more cases involving worldwide travelers.
Most people who test positive for the virus experience mild symptoms, including cough, fever and shortness of breath.More news: Astronaut Christina Koch reunited with her dog after year in space
"That is exacerbated by the truth that London is a transport hub, and the underground might present a community to unfold the virus rapidly". Jon Cohen, emeritus professor of infectious diseases at Brighton & Sussex Medical School, told The Guardian it was too early to determine the "potential risk" the London patient presented for the virus' ability to spread.
"If that is low, then the danger of sustained human-to-human transmission can also be low".
Dr Nathalie MacDermott from the National Institute for Health Research said London commuters should go about their business as usual as Public Health England investigates the patient's movements.
Earlier this week a British coronavirus "super spreader", who may have infected almost a dozen other people, was released from a London hospital after recovering from the deadly virus he picked up while in Singapore.More news: Damian Lillard to miss All-Star weekend, hopes Devin Booker gets his spot
The US has recorded at least 13 infections, and one US citizen died in China.
Details have been emerging about the two Global Positioning System who are among the nine people in the United Kingdom with COVID-19.
In order to be consistent with the classification of case diagnosis issued by other provinces across the country, starting today, Hubei Province will include the number of clinically diagnosed cases into the number of confirmed cases for publication.
Officials know that the pair worked at a nursing home, Worthing Hospital A&E and two GP practices between them.More news: Child dies from the flu at Ruby Memorial Hospital over the weekend