But no deaths have occurred in the United States.
According to O'Brien, "There's no reason for Americans to panic".
Currently, the United States has 11 known cases of coronavirus.
Vietnam counted its seventh case, a Vietnamese-American man who had a two-hour layover in Wuhan on his way from the U.S.to Ho Chi Minh City.
The first case in the Bay Area was a man who traveled to Wuhan and Shanghai before returning January 24 to California, where he became ill, Cody said Friday. A Turkish military transport plane carrying 42 people arrived in Ankara on Saturday night.
Patients can be discharged when the symptoms are alleviated, the body temperature remains at a normal range for at least three days, and the nucleic acid test shows a negative result twice, according to China's National Health Commission.
All Hubei schools will postpone the opening of the new semester until further notice and students from elsewhere who visited over the holiday will also be excused from classes.
The Department of Homeland Security, in a news release Sunday, said the agency will begin enforcing restrictions on all flights from China at 5 p.m. Americans flying from China will be re-routed to seven airports at no additional cost: John F. Kennedy International Airport in New York, Chicago O'Hare International Airport, San Francisco International Airport, Seattle-Tacoma International Airport, Daniel K. Inouye International Airport in Honolulu, Los Angeles International Airport and Hartsfield-Jackson Atlanta International Airport. "And we've got our people from the Center for Disease Control right here on the ground, helping Kazakhstan deal with this so that you don't have an enormous outbreak".
New Zealand announced Sunday it is temporarily barring travellers from China to protect the South Pacific region from the virus. "To minimize disruptions, CBP [Customs and Border Protection] and air carriers are working to identify qualifying passengers before their scheduled flights". He said USA officials had offered China "tremendous help" in dealing with the epidemic.
The Philippine government has also told citizens not to travel to mainland China, Hong Kong and Macau.
There are now eight confirmed cases of novel coronavirus reported in the United States.
"This is a serious health situation in China, but I want to emphasize the risk to the American public now is low", said Dr. Robert Redfield, director of the Centers for Disease Control and Prevention. We would like to help our Chinese colleagues if we can, "he added". "We've made the offer, and we'll- we'll see if they accept the offer", O" Brien added.
"We're working closely and hand-in-hand with the Chinese government to try and resolve what is now this global epidemiological challenge", Pompeo said.
Trump appeared to downplay concerns about the impact in the United States of the flu-like virus that has killed 350 people in China and spread to more than two dozen countries, telling Fox television in an interview, "We're gonna see what happens, but we did shut it down, yes".
The White House National Economic Council and the Council of Economic Advisers are jointly assessing the potential short-term and long-term effects of the coronavirus after Commerce Secretary Wilbur Ross said the outbreak "will help" to persuade companies to move operations back to the United States and Mexico, The Washington Post reported.
Cody said there was no risk of infection for the general public from the Santa Clara County cases.