Matthew Smith, an American passenger who remained on the ship after refusing to board the voluntary repatriation flights, tweeted that staying behind was the "best decision ever".

"US Gov't said they would not put anyone on the planes who was symptomatic, and they ended up knowingly and intentionally putting on 14 people who actually have the virus," he wrote.

Authorities around the world were also trying to track down passengers from another cruise liner, the Westerdam, which was turned away from ports across Southeast Asia for two weeks before docking in Cambodia on Thursday.

One American passenger who disembarked in Cambodia tested positive for the virus in Malaysia on Saturday.

Carnival Corp., which operates both cruise liners, said it was cooperating with authorities in trying to trace other passengers from the Westerdam. None of the other 1,454 passengers and 802 crew had reported any symptoms, it said.

"Guests who have already returned home will be contacted by their local health department and be provided further information," a statement from the company's Holland America Line unit said. Hundreds of passengers are still in Cambodia, either on the ship or in hotels.

"We will all be tested for the coronavirus today and tomorrow by the Cambodian Ministry of Health," said passenger Holley Rauen, a public health nurse and midwife from Fort Myers, Florida. "We have no idea when we get to get home."

After an extended Lunar New Year holiday, China needs to get back to work or suffer severe economic consequences. There is a proposal to delay the opening of the annual session of parliament, due on Feb. 24.

Some cities remain in lockdown, streets are deserted, employees are nervous, and travel bans and quarantine orders are in place around the country. Many factories have yet to re-open, disrupting supply chains in China and beyond.