An Auckland airport worker tested positive for COVID-19, authorities revealed Tuesday.
She said it is still possible to get COVID-19, but "it won't make you almost as sick and less likely to get really unwell".
"We know the Pfizer vaccine is highly effective, but at 95 per cent effectiveness a small number may not be protected". This is not a worker who is very unwell and yet they have Covid, so it is doing its job.
This means they are less likely to shed and infect other people.
Planes started flying freely between New Zealand and Australia for the first time in 400 days on Monday as the trans-Tasman bubble opened.
Asked about Ihumātao by the media, Ardern said it was not a botch-up by the Government. Breakthrough infections happen with all vaccines.
"Our Minister of Health has kept in touch with his counterpart".
She also said that both New Zealand and Australia are accepting that isolated new cases of COVID connected to the border were going to be part of their journey together and that this was a kind of scenario where movement between the two countries would be anticipated to continue.
According to The Guardian, the New Zealand PM further stated that by no means did it constitute a "leaky border" to have someone who cleans planes carrying infected people test positive.
"And as we know this virus is very hard to contain, and I think the public should be reassured that there are very good health and safety regulations in place".
The worker's most recent negative test was a week earlier on April 12.
There are no new community cases of Covid-19 today.
Since 1 January 2021, there have been 49 historical cases, out of a total of 425 cases.
Under the terms of the trans-Tasman bubble agreement, all states, territories and New Zealand can suspend quarantine-free travel with places that have outbreaks.
On Monday, 3252 tests were processed for a seven-day rolling average of 4254.
One was part of a bubble with two previously reported cases and had been transferred to a quarantine facility on 4 April.
Despite showing leaks in the travel bubble, Ardern said both Australia and New Zealand expected to handle border cases and had systems in place to do that without closing off the long-awaited freedom of movement.