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Prime Minister Jacinda Ardern has revealed New Zealand outside Auckland will move to Alert Level 1 tonight.
Auckland will move to level 2 on Wednesday.
Ardern said New Zealand's collective actions had brought the virus under control.
She said the two recent deaths and third earlier death connected to the Auckland cluster were a sad reminder of how serious the virus is.
Tests proved the virus had not spread beyond Auckland and Ardern said that proved the Government's approach "was the right one".
Acting swiftly had worked which meant restrictions could be eased, she said.
When the moves happen:
• For Auckland, this will be moving to level 2 at 11.59pm on Wednesday, September 23.
• For the rest of New Zealand, this will be level 1 at 11.59pm today.
Auckland would remain at level 2 for 14 days. But the move meant events with up to 100 people would be able to be held.
While at level 2 Aucklanders should not go to events with more than 100 people when they travelled outside of the city.
Until the change on Wednesday Auckland remained at a heightened alert level 2, dubbed level 2.5, with gatherings capped at 10 people except for funerals and tangihanga which are allowed 50.
"Essentially Auckland needs more time ... there is still a need in Auckland for a cautious approach."
Cabinet will review the alert levels again on Monday, October 5 whether - moving alert levels at 11.59pm on Wednesday October 7.
Auckland moving to level 1 would be dependant on there being "no surprises" and trends continuing on there current trajectory.
There could still be further cases though.
The Government had already agreed in principle to move New Zealand down to alert level 1 and Auckland to alert level 2 with eased restrictions on gatherings but the final decision was made today.
Rules around masks
In Auckland, face coverings will still be required on public transport and on planes to, from or through Auckland.
For the rest of New Zealand, face coverings will no longer be mandatory but will be encouraged on planes and public transport.
No new cases today
At the start of today's briefing director general of health Ashley Bloomfield said there were no new cases of Covid-19.
On the man who tested positive after being in managed isolation, Bloomfield said modelling backed up the current quarantine timeframe and testing.
The mystery case should be commended for his actions, said Bloomfield, and he thanked him and his family for their "quick-thinking" as it saved the virus from spreading further.
Three neighbours of the man, identified as close contacts, have all returned negative tests.
There were 86 people on his charter flight from Christchurch to Auckland are being contacted. People sitting in rows near him are all being tested.
Bloomfield said the man could have been infected on his flight from India as there were eight other cases on that flight.
Other possible scenarios are that he was infected during his time in isolation and CCTV is being reviewed, as well he could have been infected on the charter flight. Officials weren't ruling anything out, said Bloomfield.
Ardern said she was "confident we will be able to answer the question" of the mystery case.
She said the most likely outcome was the mystery case caught Covid-19 on his flight from India.
The Government was getting advice on whether they needed to do some risk-profiling of returnees or implement another test, said Ardern.
The tests could be for those who'd been on a flight where there's been cases of if they came back from a high-risk country, but for other people coming back from places where there are zero cases like Brisbane they wouldn't be needed, she said.
The Government is leaning towards additional testing, rather than extending the period of managed isolation.
Bloomfield said he'd spoken to epidemiologist Michael Baker this morning about his recommendation for "alert level 1.5" with masks still mandatory and he'd taken it on board when he recommended masks still be encouraged in places where social distancing wasn't possible.
Three in hospital
Meanwhile, there are three people in hospital.
There are 62 active cases - 29 are imported cases and 33 are community cases.
3568 tests were processed yesterday.
It comes after two new cases were confirmed yesterday - two in the community.
The latest community cases are unrelated to the Auckland cluster and stem from a man who arrived in New Zealand from India and tested negative while in isolation - sparking calls from one of the country's top epidemiologists for the Government to consider reviewing our two-week quarantine period.
The man was allowed to fly home to Auckland from a managed isolation facility in Christchurch on September 11 after leaving quarantine, but tested positive five days later.
It is unknown how the man was infected and the Ministry of Health is now investigating whether it was during his flight from India. The genome sequencing is consistent with two confirmed cases from the same flight, which landed on August 27.
"It is possible that this case was infected during that flight and has had an extremely long incubation period – there is evidence that in rare instances the incubation period can be up to 24 days," the ministry said.
But the man could have also been infected during a Government-chartered flight with other returnees in managed isolation facilities from Christchurch to Auckland after leaving the facility nine days ago. People on this flight were being contacted and assessed.
The ministry said most people who are infected with Covid-19 will become unwell within 14 days.
University of Otago epidemiologist Professor Michael Baker said cases such as the man testing positive after completing two weeks in isolation were "very unusual".
However it was documented that some people had unusually long incubation periods, and he believed it was worth reviewing whether New Zealand should lengthen the isolation period.
"Basically 14 days has always been a practical maximum, but we've always known there was potential for the maximum to be longer than 14 days in very rare cases," he said.
The person could also have been infected within the managed isolation facility, in which case the genome sequencing could connect him with another case from the facility.
Baker said each option - including the man being infected on the Christchurch flight - was concerning for different reasons, and he questioned whether further rules were needed for people leaving managed isolation.
But physics professor Shaun Hendy, who has modelled the spread of the virus, said it was feasible to move down alert levels for the whole country.
He told Morning Report the new 'cluster' was a concern but would probably not affect Cabinet's decision today because "we caught it early".
- additional reporting RNZ