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Covid-19 has re-emerged into the community for a third time - this time a worker in a Christchurch managed isolation facility.
And a supermarket in Colombo St in the city has been closed for deep-cleaning after the positive case visited the store on Sunday.
Prime Minister Jacinda Ardern said there was a testing regime that detected cases in workers at managed isolation facilities.
"Our system is utterly built for managing a situation where people who may be attached to our MIQ [managed isolation and quarantine] systems themselves find themselves positive with Covid," she said.
"Our whole system is built for that, that's why we have an ongoing testing regime. It's why, particularly our people who work in our MIQ keep very, very good records of where they've been and who they've been in contact with.
"They are very aware of their health status, so if they feel unwell they're very cautious about getting tested straight away and being isolated straight away."
New Zealanders should feel "assured" about the testing regime, though she also said it was being improved and worked upon "constantly".
Ardern told TVNZ that said health staff would now be working with the infected person on where they will go next.
"We do let the public health workers on the ground work through the best place for someone to be. Often it will be that there's a range of circumstances they'll take into account to determine where they should be," the Prime Minister said.
"But for the most part, most of the time, of course, our cases go back into a facility...this case was only identified yesterday afternoon so it's not unusual for just a bit of time to be taken to identify all of their close contacts, do the testing that needs to be undertaken and then work through making sure that we're putting the person into the facility if that's the right place for them to be," she said.
"It's not unusual just to make sure that conversations are had on the ground with the person."
The new case is a staff member working in the Christchurch managed isolation facility, understood to be the Sudima Hotel, where a group of international mariners have been staying.
The positive worker had developed symptoms for Covid-19 on Saturday and sought a further test on Sunday.
Countdown's general manager corporate affairs, safety and sustainability, Kiri Hannifin, confirmed the person visited the store, but the time of the visit was not known.
The supermarket was closed last night and was undergoing a deep clean, said Hannifin. The supermarket was expected to be open again as normal today.
The latest case in Christchurch ended 10 straight days of no community cases of the virus in New Zealand.
A total of 31 positive Covid cases are now linked to the group of mariners. They are among 440 fishers from Russia and the Ukraine, 270 of whom are due to go out on three Independent Fisheries boats next month.
The new case was tested as part of routine testing for staff at the Sudima at Christchurch Airport. They returned a negative test last Thursday, October 29.
On Saturday, however, they developed symptoms and sought a further test yesterday, returning a positive result which was received on Monday.
"The person is now in isolation at home and reports taking care to isolate themselves as soon as they developed symptoms," the Ministry of Health says.
The first of the international mariners were due to have completed their managed isolation this morning but will have it extended for at least 24 hours as an additional precautionary measure.
The ministry said full details of the case, and the actions taken in response would be provided in a 1pm press conference today.
Precautionary measures for the international mariners include additional tests - up to four for some individuals and an already lengthened stay in managed isolation.
This is the third time Covid-19 has re-emerged in the community,
New Zealand went 102 days without a case until August when an Auckland cluster forced the city into...