When the World Health Organization deemed the outbreak on Thursday a "public health emergency", it said it "does not recommend any travel or trade restriction based on the current information available".
In Europe, Spain confirmed the country's first case after a man was diagnosed on the remote island of La Gomera in the Canaries on Friday (January 31). But the CDC announced that the first US case of human to human transmission occurred in a husband and wife in Chicago.
The CDC also pointed to a limitation of its screening test for the virus - a negative result is merely a "point-in-time" snapshot that can not conclusively rule out the risk of a person developing the disease during the 14-day incubation period.
American and Delta had previously reduced service to mainland China's largest cities, including Shanghai and Beijing but announced more drastic cuts in service following a new travel advisory Thursday from the State Department about the health risks of travel to China.
So far, there are 12 cases of human-to-human transmission outside China, and Redfield said they are most concerned with "expansion of sustained community human-to-human transmission", such as the type occurring inside China.
Amid fears that the virus could spread further overseas, the United States announced measures to restrict entry to foreign nationals who have recently been in China.
Sri Lanka has confirmed one case - a 43-year-old Chinese tourist from Hubei province.
Growing numbers of major airlines have suspended or reduced China flights, while corporate names ranging from Toyota to McDonald's and Starbucks have shut down Chinese stores or production lines.
Global stocks fell sharply Friday over concerns the outbreak of coronavirus would negatively impact the world economy.
China has reported thousands of infections and more than 200 deaths from the coronavirus since it was detected in December. However, 98 of the 7,874 cases have been confirmed in 18 other countries, including the United States, Canada, France, Germany, Japan, the Philippines, and Singapore.
Red haze descends over parts of South Australia
Australia's southeast has already had to deal with the awful effects of historic bushfires and huge clouds of smoke. In New South Wales there were still 64 bush fires burning as of Tuesday, with 16 of them not yet contained.
"I want to emphasize that this is a serious health situation in China, but I want to emphasize that the risk to the American public is now low", CDC Director Robert Redfield said.
A string of travel restrictions have been announced in recent days.
China's aviation agency had said there were 117 nationals from Hubei province in Bangkok and 100 in Kota Kinabalu who are "willing to take the chartered flights back to Wuhan as soon as possible".
The death toll from the new virus, which is officially called 2019-nCov, now stands at 259.
"I'm not anxious so much about the virus as I am about being forced to go to a Chinese hospital simply for having a fever", he said.
The CDC reported Friday it had received 241 samples for testing. The number includes the infected people who do not need or seek medical attention.
A German air force jet left Wuhan to evacuate 130 people, 90 German citizens and around 40 citizens of other countries.
It was the CDC's first quarantine order in 50 years.
Basketball games at Miami University in OH were postponed after two students reportedly showed possible symptoms.
She cited emerging evidence the virus can be spread by someone who is infected but not yet showing signs of being ill, such as fever, cough and other respiratory symptoms.