The latest:

New infections fall to 349 in Hubei province, according to latest numbers released by China.

Scientists warn coronavirus, like flu, may spread easily.

Airplane standing by in Tokyo to bring home healthy Canadians aboard the Diamond Princess cruise liner.

U.S. CDC says Japan's effort not enough.

Experts say too early to tell if China outbreak contained.

China reported a dramatic drop in new cases in the province at the heart of the coronavirus outbreak, while scientists reported the new virus may spread even more easily than previously believed.

China's central Hubei province had 349 new confirmed cases on Wednesday, down from 1,693 a day earlier and lowest since Jan. 25. The death toll rose by 108, down from 132 the previous day, bringing to total in China to over 2,100 deaths and 74,000 cases.

The new figures include subtracting 279 cases in the province that were not confirmed, a larger-than-usual number. No explanation was given. Excluding the deductions, the number of new cases on Wednesday stood at 628, still a large drop.

China is struggling to get its economy back on track after imposing severe travel restrictions to contain a virus that emerged in the central province of Hubei late last year.

Beyond mainland China, six people have died from the disease, and governments around the world are trying to prevent it from spreading into a global pandemic.

Australia's Qantas Airways Ltd. said on Thursday it will ground the equivalent of 18 planes, freeze recruitment and ask its 30,000 staff to use up annual leave as it grapples with falling demand from Asia due to the epidemic.

Heading home

Hundreds of passengers trundled off a cruise ship in Japan on Wednesday after being held on board in quarantine for more than two weeks, as criticism mounted of Japan's handling of the outbreak.

Canadian Foreign Affairs Minister François-Philippe Champagne and Health Minister Patty Hajdu said Wednesday afternoon that 47 of the 256 Canadians on board the liner are infected.

The federal government has chartered a plane to airlift most of the healthy Canadian passengers back to Canada. It's expected to fly out of Japan on Thursday.

"The aircraft the government has chartered is currently in Tokyo. We will begin pre-flight screening and disembarkation tomorrow evening local time," Champagne told reporters in Ottawa.

WATCH | Foreign affairs minister discusses bringing Canadians home:

Foreign Affairs Minister François-Philippe Champagne says Canadians on board the quarantined "Diamond Princess" will be flown back to Canada tomorrow evening - but only those without symptoms will be allowed to board. 2:18

The passengers will first be taken to Trenton, Ont., where they will be assessed. They will then be transported to the NAV Canada Training Institute in Cornwall, Ont., for 14 more days of quarantine.

From Wednesday, passengers who tested negative and showed no symptoms were free to leave. Around 500 were expected to disembark on Wednesday, with the rest of those eligible leaving over the next two days. Confirmed cases were to be sent to hospital, while those who shared cabins with infected passengers may still be kept on board.

Around 180 Australian evacuees from the ship have already landed in Darwin. The passengers, who were confined to the ship in the port of Yokohama, will now begin a second 14-day quarantine period in a camp facility near the northern Australian city, Australian health officials said.

Around half of the passengers and crew are Japanese, and are free to go home once cleared to leave. Other countries, including Canada, have said they will fly passengers home and quarantine them on arrival. The United States flew more than 300 passengers to air bases in California and Texas this week.

WATCH | Passengers disembark cruise ship:

Hundreds of people began disembarking the Diamond Princess as criticism mounted over Japan's handling of the on-board outbreak. 0:58

Even as passengers rolled their luggage off the Diamond Princess cruise liner, Japanese authorities announced 79 new cases had been discovered on board, bringing the total to at least 620, well over half of the known cases outside mainland China.

The Diamond Princess has been quarantined near Tokyo since Feb. 3, initially with about 3,700 people aboard. The rapid spread of the disease on board led to criticism of the Japanese authorities just months before Japan is due to host the Olympics.

'Completely inadequate'

Infectious disease specialist Kentaro Iwata of Japan's Kobe University Hospital, who volunteered to help aboard the ship, described the infection control effort as "completely inadequate" and said basic protocols had not been followed.

"There was no single professional infection control person inside the ship and there was nobody in charge of infection prevention as a professional. The bureaucrats were in charge of everything," he said in a YouTube video.

Health Minister Katsunobu Kato defended Japan's efforts.

"Unfortunately, cases of infection have emerged, but we have to the extent possible taken appropriate steps to prevent serious cases," Kato said in a report by state broadcaster NHK.

The U.S. Centers for Disease Control and Prevention said Japan's efforts "may not have been sufficient to prevent transmission among individuals on the ship."

Clyde and Renee Smith, 80-year-old American cruise passengers hospitalized in Japan since testing positive for the virus on Feb. 3, learned on Wednesday they were still positive.

"We are very happy here," Clyde said from the couple's hospital room in western Tokyo. "They're taking excellent care of us. This is the newest, fanciest hospital I've ever seen."

From the start, experts raised questions about quarantine on the ship. Passengers were not confined to rooms until Feb. 5. The day before, as passengers were being screened, events continued, including dances, quiz games and an exercise class.

Scientists published on Wednesday preliminary findings in the New England Journal of Medicine that suggested the virus spreads easily, including through patients who have no symptoms.

"If confirmed, this is very important," said Dr. Greg Poland, a virologist and vaccine researcher with the Mayo Clinic in Rochester, Minn., who was not involved with the study.