There have been 10 new cases of COVID-19 in managed isolation over the past two days and none in the community, the Ministry of Health announced on Friday.
The seven-day rolling average of new cases detected at the border is four.
Of the 10 cases in managed isolation, five relate to people coming from India, two from people arriving from Pakistan, while the rest relate to people coming from the United States, Papua New Guinea and Portugal.
Since the beginning of January, there have been 39 historical cases, out of a total of 277, the Ministry of Health said.
The total number of active cases in New Zealand is 55.
The ministry said there was a substantial drop in the number of active cases today as the "number of active COVID-19 cases in New Zealand has been over-reported due to a process issue".
"Some recovered cases had been discharged from a managed quarantine facility but their status was not updated from active to recovered in our reporting systems.
"It has been confirmed that all positive cases were managed appropriately and there has been no risk to the community," the ministry said.
"The Ministry, Public Health Units and ESR have worked to identify the cause and put in place mitigation steps to ensure this doesn’t occur again."