Director general of health Ashley Bloomfield says all New Zealanders need to keep their guard up as we come into winter cold and flu season on the back of the Melbourne Covid-19 outbreak.

As of last night, over 650,000 vaccines doses had been delivered - over 100,000 more than this time last week.

Bloomfield and Associate Health Minister Ayesha Verrall gave an update of the vaccine rollout and said there were six new Covid-19 cases in MIQ- travellers from Brazil, Qatar and Malaysia.

More than 235,000 people had received their second dose - meaning they are now fully vaccinated.

Overall the rollout is 9 per cent ahead of schedule. Further stocks of the Pfizer vaccine had also arrived yesterday and the new advice the vaccine can be stored at typical refrigeration temperature means doses can be more easily moved around the country.

Cities continued to be shutdown overseas, and even an outbreak in Taiwan has continued to grow, highlighting the urgency for vaccines, Bloomfield said.

The Melbourne outbreak, which has grown to 60 community cases, also showed how "tricky" the virus was to deal with, Bloomfield said.

The nature of the current variant of the virus suggested it was more transmissable.

The lockdown is currently set to be lifted at 11.59pm tomorrow local time, while flights from Melbourne to New Zealand have been paused until 7.59pm on Friday, June 4.

There were now 60 cases in Victoria. New Zealand's policy would be assessed with an update tomorrow.

Everyone in New Zealand still needed to keep their guard up, especially in light of new variants overseas and winter upcoming, Bloomfield said.

People should be getting tested if they experienced any symptoms.

The best way to keep New Zealand safe into the future is to make sure everyone is vaccinated. To do this by the end of year, the virus needs to be kept out.

If the lockdown in Melbourne is extended anyone stranded and experiencing hardship needed to alert the Government through the SafeTravel website.

When New Zealanders do return home, Verrall said a risk assessment would need to be made, which could include managed isolation for returnees.

Bloomfield said if any travellers were having to return during the lockdown, they would be looking into protocols including pre-departure testing and MIQ.

Vaccine rollout in the regions

Each of the 20 DHBs around the country were tailoring their rollouts to the needs of their communities. This included a campaign targeting Māori and Pasifika in Southland, a rural outreach programme in Canterbury, and a marae near Wellington now devoting its activities to vaccinations.

Verrall said she wanted to congratulate Northland DHB on its campaign in particular.

It was encouraging the vaccine rollout was moving ahead of schedule, Bloomfield said.

He also acknowledged the extra effort of staff in Waikato and Canterbury, both dealing with other external issues.

The plan continues to have everyone vaccinated by the end of the year, Bloomfield said.

Updated vaccination advice for pregnant women is expected next week.

The plan for rollout of group 4 is being worked through, and what structure and factors to be considered, Verrall said.

There were currently 260,000 vaccine doses and 49,000 more expected to arrive next week.