A managed isolation worker at the Grand Millenium Hotel in Auckland has tested positive for Covid-19.
In a statement about 9.30pm on Monday, the Ministry of Health said the result was picked up through routine surveillance testing.
The ministry said it understood the worker was asymptomatic and further investigation was being undertaken on Monday evening.
The worker and their immediate household members were isolating at home in Auckland, but they could be moved into the Jet Park quarantine hotel on Tuesday.
The decision to allow them and their family to stay at home was made by the medical officer of health.
The ministry posted on Facebook that it did not know if the person had been vaccinated and not all border workers have had both doses of the vaccine.
At this stage, the person was not being counted as a community case, because it was likely they caught the virus through their work in managed isolation, the ministry wrote.
There were currently no new locations of interest on the ministry's website as of Monday night.
Further tests and whole genome sequencing were being arranged.
The ministry said further information would be provided once available.