The surge in US cases came as Trump's administration appeared divided on what to do with a corona-hit cruise ship stuck off the California coast, underscoring concerns about how the crisis is being handled.
The Grand Princess, which has 21 confirmed novel coronavirus infections among 3,500 people on board, is due to dock in Oakland on Monday. Trump has argued they should stay on the ship.
Cabinet Secretary Ben Carson said a plan would be in place by the time the ship docks, but refused to say what it was.
In an early-morning tweet, Trump, who has been accused of peddling misinformation on the outbreak, blamed the media for trying to make his government "look bad".
"We have a perfectly coordinated and fine tuned plan at the White House for our attack on CoronaVirus," he tweeted.
Market researchers at ANZ bank said that kind of response was fuelling financial jitters.
"Market fear hasn't been helped by concerns that the US has been slow to respond to the crisis," they told clients, "with a slow roll-out of preventative measures, a lack of transparency around containment policy, and what appears to be poor public health communication."
A report from the UN Conference on Trade, Investment and Development (UNCTAD) warned that the virus spread could hit foreign direct investments worldwide by as much as 15 percent as international business reels.
In China and South Korea there were some signs that the peak of epidemics there may have been reached.
China said it had closed most of the makeshift hospitals opened to receive coronavirus patients in the epidemic's epicentre around Wuhan as the number of new infections in the country hit a record low.
There were 40 new cases nationwide, the National Health Commission said, the lowest number of fresh cases since it started reporting the data in January.
South Korea, which has one of the largest coronavirus totals outside China, reported its smallest daily rise in cases for two weeks.
A total of 248 cases were confirmed on Sunday, the Korea Centers for Disease Control and Prevention (KCDC) said. The increase took its total to 7,382.