"Commercial carriers have reduced or suspended routes to and from China", they added.
Mongolia also halted cross-border traffic with its huge neighbour and Russian Federation sealed its remote far-eastern frontier.
Most of the overseas cases were found among people who had travelled from Wuhan, although physicians are concerned about person-to-person transmission affecting people who had not been in the major industrial centre of 11 million people in central China.
Italy and Israel on Thursday barred all flight connections with China.
In South Korea, a charter flight carrying 367 of its citizens from Wuhan, landed at the Gimpo International Airport on Friday, South Korea's foreign ministry said.
More confirmed cases are being reported from people who have never been to Wuhan.
In a sign of growing global fears, more than 6,000 tourists were temporarily confined aboard their cruise ship at an Italian port after two Chinese passengers fell ill.
Public-health officials in Ontario said that, as of Thursday morning, the province's laboratory had tested samples from 67 patients suspected of contracting the virus.
The latest numbers indicate that the daily death count and the overall spread of the virus within China were continuing to grow steadily, despite unprecedented quarantine measures imposed on Hubei a week ago and other preventative steps nationwide. To date, there have been 171 deaths, all in China. "We want to honor the Chinese people and our culture, but most importantly we want to ask for God's healing and protection on them".
China's Hubei province which is the epicentre of the virus outbreak has reported 5,806 confirmed cases, including 204 deaths, official media reported.
Statistics from China indicate that just over 2% of people infected have died, suggesting that the virus may be less deadly than the coronaviruses behind 2002-2003 Severe Acute Respiratory Syndrome (SARS) and Middle East Respiratory Syndrome (MERS).
India may conduct evacuation of its stranded citizen from Wuhan on Friday.
France on Friday airlifted around 200 of its citizens from the city. They will be placed under two-week quarantine back home.
Britain followed suit within hours, extracting 110 British and foreign nationals. "We understand that this may be concerning, but based on what we know now, we still believe the immediate risk to the American public is low".
The news makes the United States the fifth country - at least - where the infection is now spreading through human-to-human contact.
Meanwhile in India, one student who returned from Wuhan has been tested positive in Kerala and has been kept in isolation.
This is the sixth time such an emergency has been declared by the WHO.
Between the lines: James Lawler, an infectious disease physician at the University of Nebraska, said pandemic viruses like the coronavirus cause more anxiety because, unlike the flu, there are not any initial countermeasures like vaccines, antivirals, diagnostic testing and monitoring systems.
But investors took some heart Friday after the World Health Organization recommended against trade and travel restrictions for now, with Asian markets opening higher.