Coronavirus: The 'big concern' about Australia's new outbreak

As Kiwis' hopes grow for a trans-Tasman travel and tourism bubble, there's been a worrying development in recent outbreaks of coronavirus in Australia.

A dozen McDonald's restaurants across the Australian state of Victoria were closed until further notice on Sunday after a delivery driver tested positive for COVID-19.

A McDonald's spokesperson said the driver had been making deliveries and had been interacting with restaurant employees while asymptomatic and unaware they had contracted COVID-19.

Victoria Premier Daniel Andrews says there's a "really big concern" about this.

"Look, any outbreak, particularly where it comes from someone who had no symptoms at all, is obviously a really big concern," he told Australia's Today show.

"It just makes the points - or makes two points really. One, this spreads really fast. You can feel perfectly fine, have no symptoms and not be unwell in any way.

"If you were crook, you wouldn't go to work. This person didn't feel unwell. That's the first point. It is rapidly moving. It gets away from you quickly.

"The second point is that's why testing is so important. We are heading towards about 250,000 tests in the last three weeks. That is a massive effort. That gives us a real sense of how much virus is out there in the community. Not guesswork, but real data that allows us to take these slow, safe, cautious steps. Do it once and do it right."

Andrews said it was important Australia doesn't reopen too soon, which could lead to further outbreaks.

"This thing gets away from you, and then you go into an even harder lockdown. That's a very, very bad outcome."

The affected stores are being deep cleaned and there's no timeline for reopening.

Currently, people arriving into New Zealand are screened and treated differently depending on whether coronavirus symptoms are detected or not.

People symptomatic on arrival are tested and held in a quarantine facility for 14 days. Those without symptoms are placed in an approved managed isolation facility for 14 days.

The New Zealand travel and tourism industry is hopeful a trans-Tasman bubble can be set up.

Eighteen organisations are trying to come up with a solution as part of the Australia New Zealand Leadership Forum's high powered Trans-Tasman Safe Border Group. It brings together the Government, Air New Zealand, Qantas and the three biggest airports on each side of the ditch.

 Auckland Airport's CEO Adrian Littlewood says the flying experience has to change to allow for flights between New Zealand and Australia without putting travellers into quarantine.

"To prototype what a future border process might look like, so we can then test that to ensure that meets both airport and aviation requirements, as well as new health requirements, as we understand what they might be," he told Newshub Nation last week.