Chief Minister Michael Gunner reported 940 new cases on Friday, easily the Territory's highest daily total.

Cases from Thursday were also revised up from 626 to 747.

Mr Gunner said the spike in cases was mainly in Darwin as more families returned home from interstate holidays.

"It's not surprising and we can expect that to continue for a few days to a week," he said.

"This doesn't change our overall settings for the Territory, it just means it's more important than ever to stick to the measures that keep us safe."

Mr Gunner said from Monday the government would cut the interval for vaccine boosters and impose new deadlines for high-risk workers to have their third jabs.

Anyone working in a high-risk setting such as a hospital, an aged care centre or in correctional services must have their booster by March 11 or within four weeks of becoming eligible.

All other workers covered by vaccine mandates will have until April 22 to get boosted.

As well as Friday's increase in new cases, hospitalisations also rose from 95 to 105 with three people in intensive care.

Active infections across the Territory rose to 4200.

Mr Gunner said the Territory's hospital system still had adequate capacity and could take more steps, such as cuts to elective surgery, to increase it further.

"We've got more ICU beds available than we're currently using and we've got the ability to surge as well," he said.

"We want to make sure we keep our caseload within the capacity of our current hospital system to deal with.

"But if it takes a big decision, we'll make a big decision to manage our caseload."

Among Territorians in hospital with COVID-19, the vast majority are Indigenous Australians as outbreaks also continue to rise in outback communities.

Acting Deputy Chief Health Officer Marco Briceno said the higher rate was driven by the lack of adequate resources to manage coronavirus patients in their local areas.

Those resources were generally centralised in major hospitals.

"What we would like to see, and we are already seeing some signs of, is that we will build capacity in our remote hospitals and remote primary health care clinics to provide that care closer to home," Dr Briceno said.

"We hope that then the number of Indigenous Territorians in hospital will be the same as we see at any given time.

"We need to engage with community leaders and community members and healthcare organisations to see what's possible."

From Friday the Territory also revised how close contacts of COVID-19 cases are notified, with the information to be included in the check-in phone app rather than provided by individual text messages.

Australian Associated Press