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Health officials Sunday announced three more cases of the coronavirus in California, bringing the state's total to sixand the country's total to 11 cases.

Late Sunday, a San Benito County official said a man who had recently traveled back from Wuhan, China, and his wife were confirmed to have the virus and isolating themselves in their home.

The man arrived at San Francisco International Airport on January 24 and was screened and found to be healthy and asymptomatic, Dr. Martin Fenstersheib, interim health officer for the county, said in a news conference.

The next day, the man developed symptoms including a cough and low-grade fever, Fenstersheib said. A few days later, his wife began showing symptoms as well.

As far as I'm concerned there is, at the present time, absolutely no risk to the community in San Benito from coronavirus from these confirmed cases,"

The couple has stayed at home since the man's arrival, Fenstersheib said.

Also Sunday, officials confirmed a woman who recently traveled from Wuhan to Santa Clara County also was found to have the virus. She's the second case in the county -- though officials said the cases are unrelated. There are two other confirmed cases in Orange and Los Angeles counties.

Meanwhile, the World Health Organization (WHO) declared the outbreak a public health emergency of international concernearlier this week. A number of countries -- including the US -- began evacuating their nationals on flights from Wuhan, the capital of Hubei province in China where the virus was first detected.

The US also issued a level 4 travel advisorywarning residents not to travel to China, adding that most commercial air carriers have reduced or suspended flights to and from the country.

So far, at least 360 people have died and more than 17,000 have been infected in China while there's been more than 170 confirmed cases across more than 20 countries. The San Benito couple's diagnosis is the second person-to-person transmission of the virus.

In Chicago, a woman in her 60s was diagnosed after she returned from Wuhan on January 13. She is in the hospital and doing "quite well," her doctors said.

Last week, the CDC confirmed she had transmitted the virus to her husband, who had not traveled to China. He was in close contact with his wife during a long period of time when she was symptomatic, the Illinois Department of Public Health said.

A student at the Boston campus of the University of Massachusetts was the eight confirmed case. There have been two more confirmed cases of the coronavirus: one in Arizona -- which officials described as an "adult member" of the Arizona State University community -- and one in Washington state -- a man in his 30s who sought treatment after returning from Wuhan.

On Friday, Health and Human Services Secretary Alex Azar declared the coronavirus a public health emergency in the US but stressed the risk remains low and "we are working to keep this risk low."

"All agencies are working aggressively to monitor this continuously evolving situation and to keep the public informed," he said.

As part of that work, Azar announced that any US citizen who has been in Hubei Province in the past two weeks "will be subject to up to 14 days of mandatory quarantine," he said.

A second evacuation flight from mainland China is set to carry more US citizens out of Wuhan, a US official with knowledge of the matter told CNN. There is still not a definitive time for the plane's arrival in Wuhan.

The first chartered plane arrived in a Southern California air base last week carrying about 200 US citizens -- including diplomats and their families.

The CDC ordered a federal a 14-day quarantine for those passengers -- the first such order in more than half a century. (CNN)