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There are 13 new community cases in Auckland and director general of health Ashley Bloomfield has announced people who test positive will be quarantined.
Bloomfield also revealed there was one new case in managed isolation - a woman in her 30s who arrived from the Philippines. One person who had tested positive had visited an aged care facility in the Waikato.
That brings total number of active cases to 36.
He announced all of those who tested positive, as well as close family members who could be at risk, would now be put into self-isolation facilities.
All of the 13 new community transmission cases were linked to the four cases from the same family revealed on Tuesday.
Given all the cases were linked, they were being treated as clusters and director general of health Ashley Bloomfield said they "fully expected" more cases.
One of the cases is the Mt Albert Grammar School student who is a relative of one of the already confirmed cases.
The student wasn't symptomatic at school so the chance of exposure by anyone in the school community is low, said Bloomfield.
But they should monitor their health and contact Healthline if needed.
Three of the cases are Americold employees and another seven are family members of these employees.
All staff across all sites are being tested.
He said there was no blame on anyone who had caught Covid-19.
"There is no blame or shame in having Covid-19 - the virus is the problem ... people are the solution."
He thanked people for being tested.
It's important to note any positive case is isolated along with their families.
Today's test results reveal the first trends from the push for mass testing, following the re-emergence of community transmission on Tuesday.
He and Prime Minister Jacinda Ardern are giving an update on Covid-19's resurgence.
- Demand in South for testing ramps up
- Auckland arrivals with symptoms booking Covid tests in Queenstown
They are speaking from the Beehive. It follows the Herald revealing three more cases at an Auckland coolstore linked to the outbreak.
Bloomfield confirmed this morning a Mt Albert Grammar student in Auckland had tested positive - a person who was a close contact of the family whose members have tested positive.
He did not know if the student was one of the four probable cases announced yesterday.
He said some of the original family who had tested positive were in a quarantine facility but not all of them.
Tomorrow's Cabinet decision on the future of the lockdown will depend on factors including the extent of the new Covid-19 outbreak, the containment of known chains of transmission, and whether the source of infection has been found.
Bloomfield would not say this morning how he thought the decision would go.
"We are getting all our information together so we can get the best possible advice. I feel confident we will have a lot more good information to inform a good decision," he told Newstalk ZB's Mike Hosking.
Meanwhile, the Lakes District Health Board has released further information about where two people who tested positive for Covid-19 visited while in Rotorua, including the Fat Dog cafe on Sunday, August 9 between 1.30pm and 2.30pm and Burger Fuel Redwoods on August 10 between 7pm and 8pm.