There are 11 new cases of Covid-19 in the community today and eight new cases in managed isolation, including two historical cases.
Director-General of Health Ashley Bloomfield says that brings the total number of community cases, all in Auckland, to 21 - all are being transferred to a quarantine facility.
He says 12 of the 21 cases have already been confirmed as part of the same Auckland cluster and a further eight are being investigated. One of the cases is unlikely to be linked to the cluster - the Air NZ crew member that has already been reported on, he says.
"These new community cases are not unexpected, as the prime minister said, and we would expect the number of cases to continue to grow in particular because of the large number of locations of interest and the mobility of these cases over the few days before the lockdown started," Bloomfield says.
Two of the community cases were taken to North Shore Hospital overnight, Bloomfield says. One had worsening symptoms from Covid-19 and the other is symptomatic and has underlying conditions. One is in their 20s and the other is in their 40s.
Returnees on the same floor of the Crown Plaza hotel where a bubble of three tested positive will be required to stay for a longer period of time, Bloomfield says.
Officials are now investigating staff at the Crown Plaza MIQ facility and Jet Park quarantine hotel.
They do not believe the virus slipped into the community via Middlemore Hospital.
On genome sequencing, Prime Minister Jacinda Ardern says it shows the Auckland outbreak is linked to a person who travelled to New Zealand from NSW on a managed red zone flight. That person returned a positive day one test on 9 August and was transferred to Middlemore Hospital on 16 August, she said.
On wastewater testing, Bloomfield says it returned positive results from three sites: Rosedale on Auckland's North Shore and the Western and Eastern interceptors.
Further results for other samples taken around the Auckland region will be available later today.
As of this morning, more than 360 individual contacts have been identified - this does exclude contacts from large settings.
"Through the day-to-day, that number will increase significantly," Bloomfield says.
Bloomfield says all of the people tested at Auckland City Hospital have, to date, been negative.
Meanwhile, new locations of interest have been revealed for Auckland, including two cinemas, a service station and a supermarket.
And this afternoon, over 1000 new people have been deemed close contacts of a Covid-19-positive case who visited SkyCity Auckland's main casino gaming floor on the weekend.
Follow RNZ's blog for live Covid-19 updates
Here is everything that happened on day one of the lockdown
***
This is an official COVID-19 ALERT.
All of New Zealand is now at Covid-19 alert level 4.
The alert level will be reviewed after 3 days for all areas EXCEPT Auckland & Coromandel Peninsula which is likely to remain at level 4 for an initial period of 7 days.
A community case of Covid-19 has been identified.
Stay at home where possible & follow the Alert Level 4 guidelines. This will stop the spread of COVID-19 and SAVE LIVES.
Everyone is asked to:
Wear a mask and keep a 2 metre distance from others whenever you leave your home.
If you are sick, call your doctor or Healthline on 0800 358 5453 for advice about getting tested.
Keep on scanning QR codes whenever you leave your home.
Practice good hygiene - wash hands often.
Services including supermarkets, pharmacies, clinics & petrol stations will stay open at Alert Level 4. Face coverings are mandatory for all people - both employees and customers - at businesses and services operating at Alert Level 4 involving customer contact.
For more information on Alert Level 4 go to [the government website www.covid19.govt.nz]
***
RNZ is the statutory Lifeline Utility responsible for radio broadcasting under the Emergency Management Act 2002 and it has a memorandum of understanding with Government which has been activated to help deal with potential health issues related to the pandemic. RNZ's Lifeline Utility obligations do not affect our editorial independence as a public media organisation or the rigour of our news gathering and reporting operations.
As New Zealand's Lifeline Utility radio broadcaster, RNZ is required to maintain essential public information channels and news during times of national emergency and we are committed to supporting all New Zealanders.
We are also committed to looking after the health and well-being of our staff.
RNZ will continue to provide essential information services - broadcasting and publishing critical public service announcements on air, on our website and via social media channels. Comprehensive news will be available on air and via our website and digital services.
If necessary RNZ Concert and RNZ Pacific will carry news and information from RNZ National. Parliament will continue to be broadcast on the AM network when the House is sitting. As the country's public service media organisation, RNZ is committed to supporting all New Zealanders.
Kia Kaha - Stay Strong