"If a health care provider, or a public health worker, tells you to stay home for 14 days, unless you need medical care, please do that", she said.
Worldwide, more than 90,000 people have been sickened and 3,100 have died.
In the U.S., health officials announced four more people died, bringing the total to six, all in Washington state, where researchers said the virus may have been circulating undetected for weeks.
In San Antonio, a woman who had been brought to the USA from Wuhan, China, tested "weakly positive" for the virus after being released from quarantine on Saturday following two negative test results, according to a separate report in the Associated Press. He had no underlying health conditions.
According to the department's website, the state will only report confirmed cases, in which people have tested positive for COVID-19, going forward.
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The Fed's No. 2 said the virus is likely to have a "noticeable impact" on Chinese growth at least in the first quarter. But they question whether it will actually help much in the event the outbreak begins affecting USA businesses.
Officials on the United States west coast - in Washington, California and OR - have expressed concerns about infections appearing in patients who had not visited an area where there was an outbreak OR been in contact with anyone who had. The employee tested negative but company spokesman Rob Gruening told The Seattle Times the tower was being closed out of an abundance of caution. If true, that could mean that there are hundreds of undiagnosed cases in the area.
With the virus now believed to be present in at least four separate communities in the Pacific Northwest - two in northern California, one in OR and the Washington outbreak - authorities are having to go well beyond the quarantine of infected travelers and tracing of close contacts that has defined the response. Both were in critical condition. One-quarter of Kirkland's firefighters were in quarantine on Sunday because they had been to the nursing facility.
"What is happening now in the United States may be the beginning of what is happening overseas", said Dr. Nancy Messonnier of the Centers for Disease Control and Prevention, noting that in China, where the outbreak began more than two months ago, older and sicker people are about twice as likely to become seriously ill as those who are younger and healthier.
Additionally, the hospital says that it has determined that some staff may have been exposed to the virus while working in an intensive care unit where the deceased patient had been treated.
Italy raised its death toll by 18 to 52 on Monday, with 1,835 confirmed cases, majority in the Lombardy and Veneto areas of the north. The virus has now spread to 11 American states. In a sign of that, cases of "community spread" - among people with no history of travel to affected areas and no contact with people known to be infected - have now been reported in California, Washington state and Oregon. They posted their research online, but it was not published in a scientific journal or reviewed by other scientists. "It's extremely unlikely that two viruses coming from outside the United States of America independently would arrive in the same geographical area and be genetically related unless they were connected".
King County Executive Dow Constantine ordered the purchase of the motel to house and isolate patients in the Seattle suburb, which has reported more than a dozen confirmed cases, news station KOMO reported.
They flew home to China from Italy last week.