A Japanese health worker caught coronavirus on the quarantined cruise ship where 174 passengers have tested positive

  • A Japanese health worker on the cruise quarantined ship off Japan tested positive for the novel coronavirus, AFP reported.
  • The Diamond Princess got infected in late January. So far 174 people on board - plus the worker - have tested positive, out of around 500 to be tested.
  • The ship has produced more coronavirus cases than any country other than China.
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A quarantine officer on the Diamond Princess cruise ship fell sick with the Wuhan coronavirus they were trying to help control, AFP reported.

It came as health officials in Japan confirmed that at least 174 of the ship's original 3,7000 passengers have tested positive for the disease.

The Diamond Princess has now contributed more coronavirus cases to the world total than any nation other than China.

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Rising number of coronavirus cases on the Diamond Princess
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Rising number of coronavirus cases on the Diamond Princess
Journalists work near the quarantined Diamond Princess cruise ship sitting at the Yokohama Port Monday, Feb. 10, 2020, Yokohama, Japan. The operator of the ship said Monday that an additional 66 cases were found aboard. That is in addition to 70 reported earlier. (AP Photo/Eugene Hoshiko)
The quarantined cruise ship Diamond Princess anchors at the Yokohama Port, Monday, Feb. 10, 2020, Yokohama, Japan. Japan’s health ministry said Monday that about 60 more people on the quarantined cruise ship have tested positive for a new virus. (AP Photo/Eugene Hoshiko)
Officials with protective suites prepare work around the quarantined cruise ship Diamond Princess in the Yokohama Port Monday, Feb. 10, 2020, Yokohama, Japan. Japan’s health ministry said Monday that about 60 more people on the quarantined cruise ship have tested positive for a new virus. (AP Photo/Eugene Hoshiko)
Officials with protective suites walk from the quarantined cruise ship Diamond Princess in the Yokohama Port Monday, Feb. 10, 2020. Japan. Japan’s health ministry said Monday that about 60 more people on the quarantined cruise ship have tested positive for a new virus. (AP Photo/Eugene Hoshiko)
Passengers stand on the balcony of the cruise ship Diamond Princess anchored off the Yokohama Port in Yokohama, near Tokyo Monday, Feb. 10, 2020. China reported a rise in new virus cases on Monday, possibly denting optimism disease control measures that have isolated major cities might be working, while Japan reported dozens of new cases aboard the quarantined cruise ship. (AP Photo/Eugene Hoshiko)
Some banners are hang by passengers of the cruise ship Diamond Princess anchored off the Yokohama Port Monday, Feb. 10, 2020. China reported a rise in new virus cases on Monday, possibly denting optimism disease control measures that have isolated major cities might be working, while Japan reported dozens of new cases aboard the quarantined cruise ship. (AP Photo/Eugene Hoshiko)
An official with protective suites walks near the cruise ship Diamond Princess anchored off the Yokohama Port in Yokohama, near Tokyo Monday, Feb. 10, 2020. China reported a rise in new virus cases on Monday, possibly denting optimism disease control measures that have isolated major cities might be working, while Japan reported dozens of new cases aboard the quarantined cruise ship. (AP Photo/Eugene Hoshiko)
Members of the Japan Self Defense Forces prepare the truck to connect with the cruise ship Diamond Princess anchored off the Yokohama Port in Yokohama, near Tokyo Monday, Feb. 10, 2020. China reported a rise in new virus cases on Monday, possibly denting optimism disease control measures that have isolated major cities might be working, while Japan reported dozens of new cases aboard a quarantined cruise ship. (AP Photo/Eugene Hoshiko)
The cruise ship Diamond Princess is anchored off the Yokohama Port in Yokohama, near Tokyo Monday, Feb. 10, 2020. China reported a rise in new virus cases on Monday, possibly denting optimism disease control measures that have isolated major cities might be working, while Japan reported dozens of new cases aboard a quarantined cruise ship. (AP Photo/Eugene Hoshiko)
In this Feb. 9, 2020, photo, a passenger stands at the balcony of the cruise ship Diamond Princess anchored off the Yokohama Port in Yokohama, near Tokyo. Japan’s health ministry said Monday, Feb. 10 about 60 more people on the quarantined cruise ship have tested positive for a new virus. (AP Photo/Eugene Hoshiko)
Fire department members gather at the entrance of the cruise ship Diamond Princess which anchors off the Yokohama Port Sunday, Feb. 9, 2020. Japan on Saturday reported three more cases of the coronavirus aboard the Diamond Princess for a total of 64. There are 3,700 passengers and crew on the Diamond Princess who must remain on board for 14 days. (AP Photo/Eugene Hoshiko)
A passenger stands on the balcony of the quarantined cruise ship Diamond Princess anchored at the Yokohama Port in Yokohama, near Tokyo Sunday, Feb. 9, 2020. Japan on Saturday reported three more cases of the coronavirus aboard the Diamond Princess for a total of 64. There are 3,700 passengers and crew on the Diamond Princess who must remain on board for 14 days. (AP Photo/Eugene Hoshiko)
A man with wearing a protective suit walks down levels of the qurantined cruise ship Diamond Princess anchored in the Yokohama Port Sunday, Feb. 9, 2020, Yokohama, Japan. Japan on Saturday reported three more cases of the coronavirus aboard the Diamond Princess for a total of 64. There are 3,700 passengers and crew on the Diamond Princess who must remain on board for 14 days. (AP Photo/Eugene Hoshiko)
The quarantined cruise ship Diamond Princess is anchored in the Yokohama Port Sunday, Feb. 9, 2020. Japan on Saturday reported three more cases of the coronavirus aboard the Diamond Princess for a total of 64 . There are 3,700 passengers and crew on the Diamond Princess who must remain on board for 14 days. (AP Photo/Eugene Hoshiko)
Members of Japan Self Defense Forces walk into the quarantined cruise ship Diamond Princess in the Yokohama Port Sunday, Feb. 9, 2020, in Yokohama, Japan. China's death toll from the new virus outbreak has risen to over 800, surpassing the number of fatalities in the 2002-03 SARS epidemic, as other governments stepped up efforts to block the disease. (AP Photo/Eugene Hoshiko)
Passengers stand on balconies on the Diamond Princess cruise ship, with around 3,600 people quarantined onboard due to fears of the new coronavirus, at the Daikoku Pier Cruise Terminal in Yokohama port on February 10, 2020. - Around 60 more people on board the quarantined Diamond Princess cruise ship moored off Japan have been diagnosed with novel coronavirus, the country's national broadcaster said on February 10, raising the number of infected passengers and crew to around 130. (Photo by CHARLY TRIBALLEAU / AFP) (Photo by CHARLY TRIBALLEAU/AFP via Getty Images)
Passengers stand on balconies on the Diamond Princess cruise ship, with around 3,600 people quarantined onboard due to fears of the new coronavirus, at the Daikoku Pier Cruise Terminal in Yokohama port on February 10, 2020. - Around 60 more people on board the quarantined Diamond Princess cruise ship moored off Japan have been diagnosed with novel coronavirus, the country's national broadcaster said on February 10, raising the number of infected passengers and crew to around 130. (Photo by CHARLY TRIBALLEAU / AFP) (Photo by CHARLY TRIBALLEAU/AFP via Getty Images)
Passengers stand on balconies on the Diamond Princess cruise ship, with around 3,600 people quarantined onboard due to fears of the new coronavirus, at the Daikoku Pier Cruise Terminal in Yokohama port on February 10, 2020. - Around 60 more people on board the quarantined Diamond Princess cruise ship moored off Japan have been diagnosed with novel coronavirus, the country's national broadcaster said on February 10, raising the number of infected passengers and crew to around 130. (Photo by CHARLY TRIBALLEAU / AFP) (Photo by CHARLY TRIBALLEAU/AFP via Getty Images)
Passengers stand on balconies on the Diamond Princess cruise ship, with around 3,600 people quarantined onboard due to fears of the new coronavirus, at the Daikoku Pier Cruise Terminal in Yokohama port on February 10, 2020. - Around 60 more people on board the quarantined Diamond Princess cruise ship moored off Japan have been diagnosed with novel coronavirus, the country's national broadcaster said on February 10, raising the number of infected passengers and crew to around 130. (Photo by CHARLY TRIBALLEAU / AFP) (Photo by CHARLY TRIBALLEAU/AFP via Getty Images)
People wearing protective suits walk from the Diamond Princess cruise ship, with around 3,600 people quarantined onboard due to fears of the new coronavirus, at the Daikoku Pier Cruise Terminal in Yokohama port on February 10, 2020. - Around 60 more people on board the quarantined Diamond Princess cruise ship moored off Japan have been diagnosed with novel coronavirus, the country's national broadcaster said on February 10, raising the number of infected passengers and crew to around 130. (Photo by CHARLY TRIBALLEAU / AFP) (Photo by CHARLY TRIBALLEAU/AFP via Getty Images)
An ambulance carrying passengers drives away from the Diamond Princess cruise ship, with around 3,600 people quarantined onboard due to fears of the new coronavirus, at the Daikoku Pier Cruise Terminal in Yokohama port on February 10, 2020. - Around 60 more people on board the quarantined Diamond Princess cruise ship moored off Japan have been diagnosed with novel coronavirus, the country's national broadcaster said on February 10, raising the number of infected passengers and crew to around 130. (Photo by CHARLY TRIBALLEAU / AFP) (Photo by CHARLY TRIBALLEAU/AFP via Getty Images)
The Diamond Princess cruise ship, with around 3,600 people quarantined onboard due to fears of the new coronavirus, is seen anchored at the Daikoku Pier Cruise Terminal in Yokohama port on February 10, 2020. - Around 60 more people on board the quarantined Diamond Princess cruise ship moored off Japan have been diagnosed with novel coronavirus, the country's national broadcaster said on February 10, raising the number of infected passengers and crew to around 130. (Photo by CHARLY TRIBALLEAU / AFP) (Photo by CHARLY TRIBALLEAU/AFP via Getty Images)
The Diamond Princess cruise ship, with around 3,600 people quarantined onboard due to fears of the new coronavirus, is seen anchored at the Daikoku Pier Cruise Terminal in Yokohama port on February 10, 2020. - Six more people on a cruise ship off Japan are found to have the new coronavirus, the government said February 9, bringing the number who have tested positive on board to 70. (Photo by CHARLY TRIBALLEAU / AFP) (Photo by CHARLY TRIBALLEAU/AFP via Getty Images)
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After the first cases started to be found, a quarantine was imposed on the ship. It is due to expire on February 19.

At first only a handful of cases were identified, but each day has brought dozens of new ones. 

Confirmed victims have been were transported off the ship to local hospitals for treatment.

Despite taking precautions, health workers are at risk of catching the virus themselves. In China many medics have fallen sick, and at least one has died from the virus.

AFP said four hospitalized people were in critical condition and are either in intensive care or on a ventilator. 

Passengers still on board are confined to their cabins. Only those on the inner cabins have been allowed on to the main deck for fresh air, under strict instructions that they wear face masks and gloves and keep a distance from each other.

Many on board are concerned that staying on the ship is increasing their risk of catching the disease, which was on Tuesday given the formal name COVID-19.

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