The head of China's Center for Disease Control and Prevention has said himself that the source of the virus was wild animals sold at a market in Wuhan.
Governor Gavin Newsom said Disney had "made the right call in the interest of public health and agreed to shut down their California parks."
Trump said he would hold a press conference to discuss the measures on Tuesday.
The epidemic has wreaked havoc on international business, tourism, sports events, and schools, with almost 300 mn students sent home worldwide.
The death toll in the US rose to nine, many linked to a nursing home in the Seattle suburbs, while the overall number of infections shot past 100.
Globally, the virus has killed more than 3,100 people and infected over 90,000.
The Centers for Disease Control and Prevention urged Americans to be prepared to cancel mass gatherings, schools and businesses to develop teleworking plans.
The decision to delay the training was made after Seoul declared its highest "severe" alert level over the virus.
Trump has imposed tariffs on billions of dollars in goods and launched disputes with most key US trading partners over the past three years.
The Duke and Duchess of Sussex looked happy as they alighted from their commercial flight on Valentine's Day.
Cautious comments on the fallout from the virus by US Federal Reserve Chairman Jerome Powell added to the sense of calm.
Johnson has been touting the prospects of a big new trade deal with the US that can fill the void of Britain's departure from the European Union on Friday.
The US has banned Huawei from the rollout of its next generation 5G mobile networks because of concerns.
The White House said the talks would take place on Tuesday.
The US-China trade agreement lowers tensions between the two and provides a major boost to the global outlook.
Asia was given a firm lead from Wall Street, where all three main indexes ended higher.
All three main indexes on Wall Street ended in negative territory following the reading, with profit-taking also playing a role, having hit new record highs.
Wall Street's three main indexes racked up fresh records and Asia broadly followed suit, though the gains were light.
Traders were able to turn their attention back to the global economic outlook and the US-China trade deal signing planned for January 15.
Moon's appeal came after Kim threatened a demonstration of a "new strategic weapon" at a four-day ruling party meeting last week.
The strike on the outskirts of Baghdad's airport killed Iranian General Qasem Soleimani and top Iraqi commander Abu Mahdi al-Muhandis.
Prime Minister Scott Morrison, whose government has been criticised for its slow response to the emergency, pledged Aus$2 billion ($1.4 billion).