There Are Now More Than 1000 Cases Of Coronavirus In Australia

The number of coronavirus cases in NSW has ballooned to 436 after 83 new cases were identified in the state, taking the national total past the 1000 mark.

The increase comes as the NSW government discovered four cases of cruise ships disembarking in Sydney having had infected passengers on board.

It represents a spike in the number of new COVID-19 diagnoses -- with 46 recorded in NSW in the 24 hours to 8pm Thursday night before the 83 new cases were discovered in the 24 hours up until 8pm Friday night.

"The majority of cases diagnosed in NSW were either acquired overseas or are a contact of a known case," NSW Health said.

"Seventy-four cases have been locally acquired without an identified source of infection. Investigations to establish any links between cases in order to prevent further spread are ongoing."



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Health Minister Brad Hazzard urged young people to take the COVID-19 threat seriously, saying "the problem is just over the horizon, on the basis of the numbers that we're now seeing".

"It's a serious matter. Save yourself and save your family," Hazzard told reporters.

Meanwhile, the NSW government identified another four cruise ships affected by COVID-19, in addition to the Ruby Princess, which disembarked on Thursday.

As of Friday, three passengers and one crew member on the Ruby Princess had been confirmed to have coronavirus.

Passengers disembark from the Ruby Princess in Sydney on Thursday. Image: AAP.

Of the four other ships, two infected passengers travelled on separate journeys of the Voyager of the Seas. Another two holidayed on the Ovation of the Seas and the Celebrity Solstice.

NSW Health in a statement said its risk assessments for cruise ships were "far in excess" of those in other jurisdictions.

All travellers from international cruises are required to self-quarantine for 14 days after they disembark, NSW Health said.



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Meanwhile, the state government has signed a public health order to restrict movement to Lord Howe Island, so non-residents can't enter unless they're health and other essential service workers.

Residents returning the island will be made to self quarantine for 14 days.