"What China shows is that early containment and identification of cases can work, but we now need to implement that in other countries", said Dr. Nathalie MacDermott, an infectious-diseases expert at King's College London.
Worldwide, more than 90,000 people have been sickened and 3,100 have died.
All nine of the US deaths have been in Washington state, with most coming from patients at a long-term nursing facility in Kirkland, just outside of Seattle.
A senior USA official said he was concerned the numbers in the United States, now at more than 75 confirmed cases and two deaths, could jump in coming weeks.
Washington state has found itself at the center of the U.S. coronavirus outbreak with health officials on Monday confirming 18 cases, including six deaths, many of them linked to a nursing home in the Seattle area. The nine cases include four tied to a suburban Seattle care facility that has reported multiple virus cases and deaths.
After the operation, the 66-year-old COVID-19 patient is now in stable condition, with the transplanted lungs oxygenating well, the hospital said.
Health officials in King County, Washington state, brief the media on the six deaths.
A female in her 90s, hospitalized at EvergreenHealth in Kirkland.
Dow Plunges as Market Falls 10% From Record High
More than 82,000 people have been infected by the virus and the death toll stands at more than 2,800 globally. ET, Dow e-minis were down 384 points, or 1.43%, while Nasdaq 100 e-minis were down 137.75 points, or 1.56%.
Dandong, the northern Chinese city which borders North Korea, said it would test all visitors who arrived in the city from February 12.
A man in 60s, hospitalized at Virginia Mason Medical Center. In addition to the 14 King County cases, four residents of nearby Snohomish County have tested positive for the virus, officials said. More schools in the Seattle area closed on Monday as cases increased.
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. No known exposures. He is in stable but critical condition. On Sunday night, the International Association of Fire Fighters said 25 members who responded to calls for help at the nursing facility are being quarantined.
"We have determined that some staff may have been exposed while working in an intensive care unit where the patient had been treated", UW Medicine told Newsweek.
Washington state now has at least 18 cases. "I am hearing from people personally across our state who are frustrated", Murray said. In Oregon, the state Health Authority said Sunday that a second person in the state tested positive for the virus. Elsewhere in the country, the states of New York, Florida, and Rhode Island each reported their first cases, all linked to recent foreign travel. On Monday South Korea had had 26 deaths and another 599 people having contracted the virus - while its overall tally sits at 4,335 after a major jump on Saturday.
The coronavirus, which emerged in the central Chinese city of Wuhan late a year ago, has spread rapidly around the world over the past week, with more new cases now appearing outside China than within.
Scientists not affiliated with the research said the results did not necessarily surprise them and pointed out that for many people - especially younger, healthier ones - the symptoms are not much worse than a flu or bad cold.