TOKYO, - Around 500 passengers on the virus-hit cruise ship quarantined off Yokohama near Tokyo were set to disembark on Wednesday, although those sharing a room with people testing positive would have to stay on board longer, media and officials said.The Diamond Princess, operated by Carnival Corp, has been quarantined in Yokohama since Feb. 3 after a man, who disembarked in Hong Kong before it travelled to Japan, was diagnosed with the virus. The ship currently hosts 15 Israelis, 3 of which have been diagnosed with the virus. More than 540 people have been infected with the virus on the liner, which originally carried some 3,700 passengers and crew. Many of those infected have been transfered to hospitals. About half the passengers are Japanese.Around 500 people were expected to disembark on Wednesday, public broadcaster NHK said, with the entire process completed by Friday.The United States evacuated more than 300 nationals on Monday on two chartered flights and six South Koreans and one Japanese spouse flew to South Korea on Wednesday morning on a chartered flight.Australian Prime Minister Scott Morrison said on Tuesday there were 220 Australians on board. A total of 169 Australians will be evacuated, 36 have been diagnosed with coronavirus and will remain on the ship, and another 15 have elected to stay onboard. Those evacuated will be flown to Darwin, where they will be quarantined for 14 days.An Australian passenger said Australian nationals had been told they would be pre-screened starting on Wednesday morning and taken to Tokyo's Haneda airport in the evening for an expected departure early Thursday.A captain's announcement on the liner said that Hong Kong passengers would also be evacuated over the next 24 hours and that according to information received, a Canadian charter flight would arrive on Friday morning, according to a tweet by a passenger with the handle @daxa_tw.Italy and Taiwan were also preparing to evacuate their nationals.Japan, which ranks second in the world after China in number of confirmed virus cases has come under fire for its handling of the cruise ship quarantine, although top government officials have defended the quarantine and onboard testing operation.Besides those on the cruise liner and returnees brought home from China's Wuhan city, the epicentre of the epidemic, about 60 cases of domestic infections have been confirmed in Japan, including 22 in Tokyo, according to NHK public broadcaster.Amid worries about a contracting economy, the spread of the virus has prompted Tokyo to curb the size of public gatherings and some companies are telling employees to work from home.