A virus similar to the SARS pathogen has killed hundreds of people and spread around the world since emerging in a market in the central Chinese city of Wuhan.
China's National Health Commission has said nearly 30,000 people have been infected by the novel coronavirus.
Outside mainland China, there have been more than 150 infections reported in more than 30 countries and regions.
The World Health Organization has declared an international emergency over the outbreak.
Here are the places that have confirmed cases of the 2019 novel coronavirus:
China
As of 7 February, 31,161 people have been infected across China, the majority in and around Wuhan.
Most of those who have died were in that region, but officials have confirmed multiple deaths elsewhere, including in the capital Beijing.
Two territories outside of mainland China - Macau and Hong Kong - also have confirmed cases.
Sixty-one people on board the Diamond Princess cruise ship have the virus.
Europe
Britain
British health officials have announced that three people have tested positive for the virus.
Finland
A tourist from Wuhan tested positive for the virus on Wednesday 29 January and is being treated in isolation in hospital.
France
There are six known cases in France, the first European country to be affected.
Germany
Germany now has 13 confirmed cases.
Italy
There are three confirmed cases.
Russia
Russia said on 31 January that two Chinese citizens had tested positive in the country's first cases.
Sweden
Sweden has announced its first case on 31 January, a woman whose nationality has not been revealed.
Spain
Spain reported its first case on 31 January in a man on the island of La Gomera in the Canaries who was one of five people isolated after coming into contact with a German man with the illness.
Asia-Pacific
Australia
Fifteen patients have been confirmed in Australia. Most of them arrived in the country from Wuhan or Hubei province.
Cambodia
Cambodia's health ministry has so far reported one case, a 60-year-old man who arrived from Wuhan.
India
Officials confirmed the first case in Kerala, southern India, on Thursday 30 January. Two more cases have been confirmed.
Japan
Health authorities have registered 25 cases, including two cases of human-to-human transmission.
Malaysia
Malaysia has confirmed 15 cases so far.
Nepal
Nepal has reported one case so far: a man who arrived from Wuhan.
The Philippines
The Philippines has reported three cases of the virus, including one death.
Singapore
Singapore has 33 confirmed cases.
South Korea
South Korea has confirmed 24 cases of the virus.
Sri Lanka
Sri Lanka has confirmed one case, a 43-year-old Chinese tourist from Hubei province.
Taiwan
Taiwan has uncovered 16 cases so far, including two female Chinese nationals in their 70s who arrived in the country as part of a tour group.
Thailand
Thailand has announced 25 confirmed infections.
Vietnam
Vietnam has ten confirmed cases.
North America
Canada
Canada has confirmed five cases so far.
United States
The US has confirmed 12 cases.
Middle East
United Arab Emirates
UAE health officials said Wednesday a Chinese family of four had all tested positive for the virus after arriving from Wuhan several days ago. There are now five confirmed cases there.
