New Zealand has recorded no new locally acquired COVID-19 cases, a day after three positive tests in Auckland sent the city into lockdown.
The Ministry of Health said there were no new cases recorded on Monday but five cases of COVID-19 were reported in managed isolation.
An Auckland couple and their daughter tested positive to COVID-19 on Sunday, becoming the country's first cases of coronavirus in the community since January.
The results of genomic sequencing have revealed the mother and daughter have the UK variant of COVID-19.
The Ministry of Health said scanning of the international genome database was being carried out to determine if there was a match.
Contact tracing has identified 10 close contacts outside the household. Six of the close contacts have returned a negative test and four results still pending.
On Monday morning, New Zealand Prime Minister Jacinda Ardern said it was not clear how the Auckland residents contracted the UK strain of COVID 19.
Ms Ardern said the cases were not linked to hotel quarantine.
"The other possibility is international airline crew.
"International airline crew have the uniforms washed and cleaned at the laundry where the individual in question who's become infected works."
The mother from the infected family works at an airline catering company.
As a precaution, food and beverage on Air New Zealand flights have been suspended for domestic routes.
Australia stops quarantine-free travel from NZ
In response to the three Auckland cases, Australia has stopped quarantine-free travel for New Zealanders,
The trans-Tasman bubble was set up so people could fly from New Zealand to Australia without needing to spend 14 days in a hotel.
However, Australia's expert medical panel decided late on Sunday night to change the system.
New Zealanders that fly into Australia from Monday will have to spend a fortnight in hotel quarantine.
The new rule will remain in place for the next three days before the situation is reassessed.
Victorian Premier Daniel Andrews said he spoke to Ms Ardern about a flight that arrived in Victoria from New Zealand on Sunday with 152 people on board.
He said authorities had been contacting each of the passengers to determine if they were still in Victoria or if they had travelled on to elsewhere in Australia.
Mr Andrews said those passengers still in Victoria needed to get tested and isolate until they received a negative result.
Auckland went into lockdown at 11:59pm on Sunday and the rest of New Zealand's COVID-19 alert level was raised to level two.
Ms Ardern, who has urged Aucklanders to "stay home", said alert levels would be reviewed in 24 hours as her Government did more testing.
She is scheduled to speak at a press conference on Monday afternoon.
ABC
