Coronavirus, 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, as of 28 January:
More than 4,000 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 28 January.
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.
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's health ministry reported the country's first case of the virus on 27 January: a 60-year-old man who arrived from Wuhan and is now stable in an isolation room.
Japan's health authorities confirmed the country's fifth and sixth cases on 28 January, 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 confirmed its fourth case on Sunday. All are Chinese nationals on holiday from Wuhan who arrived in the country from Singapore.
Nepal said a 32-year-old man arriving from Wuhan had the disease. The patient, who was initially quarantined, recovered and was discharged.
Singapore has so far confirmed seven cases of the coronavirus -- all of them arrivals from Wuhan.
South Korean media reported the country's fourth case on 27 January, citing the national Centers for Disease Control and Prevention. The three men and a woman all travelled from Wuhan.
Sri Lanka confirmed its first case of the virus on 27 January, 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 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 22 January.
Thailand announced 14 confirmed infections on 28 January, the highest outside 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 has so far confirmed two cases of the virus. An infected man from Wuhan travelled to Ho Chi Minh City earlier this month and passed the virus on to his son.
Canada confirmed its first case of the virus on 27 January, a man who travelled to Wuhan, and has reported a second suspected case, his wife, who made the trip with him.
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.
There are three known cases of the coronavirus in France, the first European country to be affected by the outbreak.
One person is sick in Bordeaux and another is ill in Paris. A third person, a close relative of one of the other two, has also been confirmed to have the virus.
All three had recently travelled to China and have been placed in isolation.
The country's first case, and the first case of human-to-human transmission on European soil, was confirmed on 28 January in the southern Bavarian region.
The patient caught the disease from a Chinese colleague who visited Germany last week, officials said.