This person was not exposed to anyone known to be infected with the virus, and hadn't recently traveled outside the United States.
The hospital where the patient is being treated in California described one of the more serious cases of infection seen so far in the us, according a report in a local newspaper, with the patient arriving after being intubated and put on a ventilator.
The virus can cause fever, coughing, wheezing and pneumonia.
The CDC has released a colourful visual aid to help people who sport beards alter the style to allow their face masks to sit more effectively.
At the White House, Trump said he was not ready to institute new travel restrictions for countries such as South Korea and Italy that are dealing with outbreaks - although he could not rule it out.
The patient is now being treated at UC Davis Medical Center after being transferred from another hospital on February 19, according to the Davis Enterprise newspaper, citing a letter from hospital officials.
Fox News medical contributor Dr. Marc Siegel reports from the University of Nebraska Medical Center where patients are being treated.
"We continue to work very closely with county and state public health officials, UC Davis, as well as the CDC, and thank them for their coordination and assistance", added Brewer.
CDPH says the risk to the general public remains low, and that they are assessing the situation as it evolves.
"At this point, the patient's exposure is unknown", the C.D.C. statement said.
Canada warns indigenous rail blockades could cripple economy
A group called Wet'suwet'en Strong: Hamilton in Solidarity, claimed responsibility for the blockade. He said the prime minister's plea for patience last week prevented police from acting sooner.
At a White House briefing, Trump defended his administration's handling of the crisis and said health experts were "ready, willing and able" to move quickly if the virus spreads.
They are now working to track others with whom the patient may have had contact.
The Ohio Department of Health announced a new coronavirus investigation Thursday afternoon, the eighth in the state. So, out of an abundance of caution, in order to assure the health and safety of our employees, we are asking a small number of employees to stay home and monitor their temperature.
Get The Brief. Sign up to receive the top stories you need to know right now.. "We requested COVID-19 testing by the CDC, since neither Sacramento County nor CDPH [California Department of Public Health] is doing testing for coronavirus at this time".
U.S. health officials have confirmed a new case of coronavirus infection in California that could be a sign that the virus is spreading in an American community.
The California Department of Public Health said the patient is a resident of Solano County, an area between San Francisco and Sacramento, and that the person was receiving medical care.
"It's not so much a question of if this will happen anymore, but rather more a question of exactly when this will happen", said the CDC's Nancy Messonnier. Markets have been roiled by increasing concerns that an outbreak that began in China, infecting more than 75,000 people there and killing over 2,700, has slipped through global efforts to contain it and is now propagating around the world.
The CDC ordered that the patient be tested Sunday - four days after being admitted to UC Davis, according to the report.
President Donald Trump on Wednesday evening appointed Vice President Mike Pence as the new head of the task force coordinating the battle against the virus.
There's been at least 82,056 confirmed cases worldwide and 2,800 deaths - the vast majority of which have been in China.