A SARS-like virus has claimed 26 lives since emerging on December 31 in a market in the Chinese city of Wuhan.
Here is a list of countries that have confirmed cases of the so-called coronavirus.
As of Friday, more than 800 people have been infected across China, with 177 in serious condition. Authorities were also examining 1,072 suspected cases.
Officials also confirmed the second virus death outside the Wuhan region, saying a patient died in Heilongjiang province, 2,000 kilometres (1,200 miles) to the northeast.
The city of Macau, a gambling hub hugely popular with mainland tourists, has confirmed two cases. The first was a 52-year-old businesswoman from Wuhan who arrived in Macau by high-speed rail on Sunday, via the neighbouring city of Zhuhai.
As of Thursday, two people have tested positive in Hong Kong. Both had visited Wuhan in recent days and are being treated in isolation wards in hospital.
Australia confirmed its first four cases of the new coronavirus in two different cities on Saturday, with the country's chief health official saying he expected more cases as Australia was a popular destination for Chinese tourists, reports Reuters.
Three men, aged 53, 43 and 35 were in a stable condition in Sydney's Westmead hospital after they were confirmed to have the virus on Saturday after returning from China earlier this month, said the New South Wales state Health Minister Brad Hazzard.
Malaysia on Saturday said it had confirmed three cases of coronavirus infection.
Health Minister Dzulkefly Ahmad said the three individuals infected were Chinese nationals and related to the 66-year-old man that was confirmed by Singapore health authorities to have tested positive for the virus.
The newly-identified coronavirus can cause pneumonia, which has been deadly in some cases. It is still too early to know just how dangerous it is and how easily it spreads between people.
The infected individuals were a 65-year-old woman, who is the wife of the man detected with the virus in Singapore, and their two grandsons, aged 11 and 2, Dzulkefly said.
The three have been admitted to Sungai Buloh hospital in Kuala Lumpur for treatment and were considered in stable conditions, the minister said at a news conference.
On Friday two cases were confirmed in France, the first in Europe. One was in Paris while the other was in the city of Bordeaux, the country's health minister said. Both had traveled to China and both were placed in isolation.
Japan's health authorities confirmed a second case on Friday, Kyodo news agency reported, saying the patient was a man in his 40s who was originally from Wuhan and on a trip to Japan.
The country's first case was reported by the health ministry last week: a man who had visited Wuhan and was hospitalised on January 10, four days after his return to Japan.
Nepal's health authorities on Friday confirmed their first case — a 32-year-old man arriving from Wuhan, China. It is the first South Asian country to report the deadly disease.
The patient, who was initially quarantined, recovered and was discharged. The government said that surveillance has been increased at the airport "and suspicious patients entering Nepal are being monitored."
Singapore has announced at least three cases: a 66-year-old man and his 37-year-old son, who arrived in Singapore Monday from Wuhan, and a 52-year-old Wuhan woman, who arrived in the city-state on Tuesday.
South Korea confirmed on Friday its second case of the virus.
The health ministry said a South Korean man in his 50s started experiencing symptoms while working in Wuhan on Jan 10. He was tested after his return earlier this week, and the virus was confirmed.
The country reported its first case on January 20 — a 35-year-old woman who flew in from Wuhan.
On Wednesday, authorities confirmed the first case on the self-ruled island of Taiwan — a Taiwanese woman in her fifties, living in Wuhan, who returned to the island on Monday with symptoms including fever, coughing and a sore throat.
Thailand has detected four cases so far — three Chinese nationals from Wuhan and a 73-year-old Thai woman who came back from the Chinese city this month.
Two of the Chinese patients were treated, cured and have travelled back to their country, the Thai health ministry said this week.
On Tuesday US health officials announced the country's first case, a man in his 30s living near Seattle. On Friday a second case was announced – a woman in her 60s living in Chicago. Both were treated and are recovering.
Vietnam confirmed two cases of the virus on Thursday. An infected man from Wuhan travelled to Ho Chi Minh City earlier this month and passed the virus onto his son.
Both are being treated in hospital and are stable, Vietnam health officials said.