"This situation is rapidly evolving". She wasn't traveling with anyone but those close to her in her home are being monitored for symptoms, Arwady added. Overall, the CDC is now investigating 63 people (including the two that tested positive) in 22 states for a possible infection with the new virus. To date 11 of them have been ruled out, having tested positive for other respiratory illnesses.
The 60-year-old woman from Chicago had travelled to Wuhan in December and returned January 13.
The test results means there are now no cases of coronavirus in Quebec, said Horacio Arruda, Quebec's director of public health. The Illinois Department of Public Health, as well as the Chicago Department of Public Health, are taking steps to investigate locations where the patient may have visited between returning to the US and being admitted to the hospital, but said the patient had limited movement outside the home.
"We know that this virus can cause severe disease, and that it can kill, although for most people it causes milder symptoms", he said.
The virus originated in the city of Wuhan, China, where officials warn that there are likely more widespread cases in which have not yet been reported. To date there is no indication anyone who was in contact with the man in Washington has become ill, Messonnier said.
The coronavirus has infected more than 600 people worldwide, though mostly in China.
China has effectively quarantined almost 20 million people in Hubei province, with no planes or trains in or out of Wuhan. At least 10 countries outside China have reported 26 cases. Since then, it has spread throughout the country, with several cases emerging in other parts of Asia and one in the U.S.
The virus - a "novel coronavirus" dubbed 2019-nCoV, belongs to the same family as severe acute respiratory syndrome (SARS) and Middle East respiratory syndrome (MERS).
The hospital will have a capacity of 1,000 beds spread over 25,000 square metres (270,000 square feet), the official Xinhua news agency said. There are two ways this outbreak could pan out.
"Make no mistake, this is now an emergency in China, but this has not yet become a global health emergency", said Dr. Tedros Adhanom Ghebreyesus, director-general of the WHO, on Thursday.
Tedros Adhanom Ghebreyesus, the World Health Organization director-general, said the outbreak is an emergency in China, but doesn't yet constitute a global crisis.