Director-General of Health Ashley Bloomfield says the one new case in managed isolation is a woman in her 30s who arrived from the Philippines.

There are a total of 36 active cases in New Zealand. All of them are linked and being treated as a cluster.

Dr Bloomfield says that one of the new cases is a student at Mt Albert Grammar School, as was made public this morning.

"The student was not symptomatic while at school and has not been at school since they became unwell and got tested so the chance of exposure ... is low at this point."

Dr Bloomfield has confirmed that three of the people who have tested positive are workers at Americold, and seven are family members of the initial cases.

One person who has tested positive is an employee of Finance Now, and another person who has tested positive is their family member. There is also one new probable case in the community, which is also linked to the outbreak.

One of the people who tested positive visited an aged care facility in Waikato. Anyone who has visited recently will be notified.

Dr Bloomfield is not naming the facility yet as residents there are still being notified.

He says all new positive cases will now be treated in quarantine facilities.

"It will help us avoid any further inadvertent spread."

Laboratories processed 6006 tests yesterday. Dr Bloomfield says the total swabs collected yesterday was well over 10,000 but because the cutoff time for reporting is midnight not all of the results have been included.

Two more pop-up testing sites have been stood up in Henderson and Airport Oaks.

The testing centres in Rotorua and Taupo have extended their hours.