The Mattina container ship remains in quarantine at a secure berth in Bluff.

Thirteen of the original 21 Filipino and Ukrainian crew members are quarantining on board the vessel, after testing positive for the delta variant of Covid-19.

Others are spread across hospitals, facilities and arranged accommodation in Southland and Christchurch.

"Every possible public health precaution is being taken to care for the mariners in a way that provides the health care they need, and keeps health workers, port workers and the community safe," a Ministry of Health spokesperson says.

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One mariner from the Marshall Islands-flagged ship remains in Southland Hospital with his condition improving, while another was discharged on Monday but requires ongoing medical care for an unrelated condition.

"He has been safely transferred to Southern DHB arranged accommodation, where his health can continue to be monitored and treated."

Another mariner, who has tested COVID-19 negative, remains in arranged accommodation in Southland.

Five others, who have consistently tested negative for COVID-19, are now in a managed isolation facility in Christchurch, as is one other who has serological evidence of a historical COVID-19 infection.

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He was originally required to remain on board to maintain the basic functions of the vessel. However, the decision was made that he could disembark for isolation at an MIQ.

"Transportation from the ship to quarantine for this mariner was carried out using all Infection, Prevention and Control procedures including the use of appropriate PPE."

There were no cases of COVID-19 to report in the community yesterday, and only one historical case in MIQ.

The number of active cases in MIQ and hospital in New Zealand is 30. The seven-day rolling average of new cases detected at the border is two.

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The total number of confirmed cases since the pandemic began is 2,521.

Quarantine Free Travel with Australia remains suspended

Eligible travellers needing to return to New Zealand from all Australian states (except New South Wales) were given a 7-day window which ended at 11.59pm on Friday, 30 July.

"As a result of Queensland’s decision over the weekend to enter a three-day lockdown in parts of the state, we’re contacting all travellers who’ve returned since last Monday, asking them to check locations of interest on the Queensland Health website and monitor for any symptoms of COVID-19.

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"If people have returned on one of those managed return flights since last Monday, and have been at a location of interest at the relevant time, they should immediately isolate at home or appropriate accommodation and call Healthline on 0800 358 5453 for advice on testing."

Contact tracing teams have identified 4,884 people who've travelled back from Queensland since last Monday and have made contact with 4,681 people, using details from Nau Mai Râ, to provide them with this advice.

Contract tracing staff have also identified 2,997 people who returned on managed flights from Victoria between 25 and 30 July and have been required under a section 70 notice to isolate until a negative day 3 test. This number has reduced by two from yesterday, as people have been contacted and their travel history amended.

Of those 1,885 have so far returned a negative test; 526 tests results are due within the next couple of days; and the remainder are currently being assessed for follow-up.

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Vaccination roll-out update

More than 1.979 million doses of the COVID-19 vaccine have been administered to date (to 11.59pm on 2 August).

Of these, 1.221 million are first doses and more than 757,000 are second doses.

More than 110,600 Māori have received their first vaccination. Of these, around 71,000 have also had their second vaccinations.

Nearly 76,300 doses have been administered to Pacific peoples. Of these, around 48,300 have also received their second doses.

Yesterday (2 August) nearly 35,000 doses in total were administered made up of 25,500 first doses and nearly 9400 second doses.