A virus similar to the SARS pathogen has claimed 106 lives since emerging in a market in the central Chinese city of Wuhan, and spread around the world.
Here are the places that have confirmed cases of the 2019 Novel Coronavirus:
CHINA
As of Tuesday, more than 4,500 people have been infected across China, the bulk of them in and around Wuhan.
Most of the 106 who have died were in that region, but officials have confirmed multiple deaths elsewhere, including the first in the capital Beijing.
Macau, a gambling hub hugely popular with mainland tourists, has confirmed seven cases as of Tuesday.
In Hong Kong, eight people are known to have the disease. Of those, six arrived via a newly built high-speed train terminal that connects the city to the mainland.
ASIA-PACIFIC REGION
Australia
Five cases have been confirmed in Australia -- all of whom arrived in the country from Wuhan. The patients are being treated in hospitals in Sydney and Melbourne.
Cambodia
Cambodia's health ministry reported the country's first case of the virus on Monday: a 60-year-old man who arrived from Wuhan and is now stable in an isolation room.
Japan
Japan's health authorities had confirmed seven cases as on Tuesday, including its first case of human-to-human transmission.
According to Japanese authorities, the infected man in his 60s had not visited Wuhan but had recently transported tourists from the area on his bus.
Malaysia
Malaysia confirmed its fourth case on Sunday. All are Chinese nationals on holiday from Wuhan who arrived in the country from Singapore.
Nepal
Nepal said a 32-year-old man arriving from Wuhan had the disease. The patient, who was initially quarantined, recovered and was discharged.
Singapore
Singapore has so far confirmed seven cases of the coronavirus -- all of them arrivals from Wuhan.
South Korea
South Korean media reported the country's fourth case on Monday, citing the national Centers for Disease Control and Prevention. The three men and a woman all travelled from Wuhan.
Sri Lanka
Sri Lanka confirmed its first case of the virus on Monday -- a 43-year-old Chinese woman who entered the country as a tourist last week from Hubei province.
She is being treated in hospital, a spokesman at the Infectious Diseases Hospital near Colombo told AFP.
Taiwan
Taiwan has uncovered seven cases so far, the latest two female Chinese nationals in their seventies, who arrived in the country as part of a tour group on January 22.
Thailand
Thailand announced 14 confirmed infections Tuesday -- the highest outside of China.
Health officials said that of the six new cases -- all Chinese passengers from Wuhan -- five of them were in the same family, ranging in ages six to 70.
Vietnam
Vietnam has so far confirmed two cases of the virus. An infected man arrived in Ho Chi Minh City earlier this month from Wuhan, and possibly passed the virus on to son, who had been in the city a few months earlier
NORTH AMERICA
Canada
Canada confirmed its first case of the virus on Monday, a man who travelled to Wuhan, and has reported a second suspected case -- his wife, who made the trip with him.
United States
The US has confirmed five cases of the virus in patients who had recently entered the country from Wuhan -- two in California and one each in Arizona, Chicago and Washington state.
EUROPE
France
There are four known cases of the coronavirus in France, the first European country to be affected by the outbreak.
The fourth case, an elderly Chinese tourist, was in serious condition in hospital on Tuesday, health officials said.
Germany
The country's first case -- and the first case of human-to-human transmission on European soil -- was confirmed on Tuesday in the southern Bavarian region.
The patient caught the disease from a Chinese colleague who visited Germany last week, officials said.
Agence France-Presse