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South Australians in Queensland have been urged to consider returning as soon as possible as the Sunshine State continues to battle a COVID-19 outbreak.

With southeast Queensland in lockdown, SA residents are still allowed to return provided they spend 14 days in home quarantine.

But Premier Steven Marshall says that may change in the coming days and local residents may face tougher restrictions, including the need to seek a special exemption to come home.

"People need to be thinking now about whether they should be staying in Queensland or coming back," the premier said on Monday.

As well as Queensland, SA also has hard borders in place with NSW and Victoria.

The NSW closure will not change during the current Sydney outbreak, but SA could move to ease the situation soon for people coming from regional Victoria and later Melbourne.

The state's transition committee on Monday resolved to ease some local coronavirus restrictions from Thursday, including a change in the general density rule to one person to every two square metres, essentially allowing most venues to move to 50 per cent capacity.

Sports competition can resume with limits on spectator numbers, but SA will keep mask-wearing in place for high-risk settings, high schools and most public places, including shopping centres.

Family gatherings will continue to be limited to 10 people and weddings at funerals will stay at 50 people.

The changes come after SA stared down its own cluster of COVID-19 infections, sparked two weeks ago after a man returned from Argentina and tested positive after quarantining in Sydney.

Mr Marshall said it was still possible for more cases to emerge but SA was in a much different position than it was when the outbreak was first sparked after the decision to "go hard and go early" with a week-long statewide lockdown.

"We are still concerned. Yes, it has been 14 days. But if we have missed any cases in South Australia we would be picking them up around about now," the premier said.

"So we really do need to be a little bit careful these next couple of days."

Chief Public Health Officer Nicola Spurrier said with NSW and Queensland battling outbreaks of the Delta variant of COVID-19, SA was still at risk.

"The Delta variant has changed the landscape. It has made it a lot more difficult," she said.

The new arrangements in SA are likely to stay in place for at least a week, though Police Commissioner Grant Stevens said they were also subject to continual assessment.

"If we do see significant factors that allow us to make changes, we certainly will," he said.

"But we'd be looking at a week before we take any further steps."

Mr Stevens also praised South Australians for masking up and continuing to take the risk of COVID-19 seriously.

"It shows a great sense of community, that everyone is doing the right thing," he said.

"It does give us the confidence to manage risk in a different way and maybe take a step further in relaxing restrictions.

"I'm grateful to see so many people readily accepting this imposition."

SA reported one new COVID-19 case on Monday, in a child who recently returned from overseas.

The girl is in hotel quarantine but considered to have an old infection.

The state has 28 active infections with 21 of those linked to the Modbury cluster.

© AAP 2021

NSW has recorded 207 new local COVID-19 cases and another death as vaccinations remain a focus for authorities trying to forge a path out of Sydney's lockdown.

At least 72 cases were in the community during part or all of their infectious period, with the infection status of another 46 cases unknown.

"It is really in our hands as to how we deal with the cases coming down as a community but also our rate of vaccinations," Premier Gladys Berejiklian said on Monday.

"One learning we have had in the last five weeks is that the vaccinations, both vaccines, are working extremely effectively.

"We still don't know of anybody in intensive care who has received both doses of the vaccine."

One outbreak is in a Summer Hill aged care facility, where cases now number 14 and all residents on one floor are being treated or monitored in hospital.

Health Minister Brad Hazzard said an event was linked to the virus' spread in the facility where 10 of the 61 residents and one in every four workers were not vaccinated.

"Sometimes it isn't a good idea to have a 'Christmas in July' right in the middle of a pandemic but I do understand that it is an effort to try and provide entertainment and support to residents," he told reporters.

Spread in workplaces is also a threat, with one workplace resulting in 30 infections, NSW Chief Health Officer Kerry Chant said.

"It is critical that people don't work whilst they have symptoms," she said.

Of the 207 cases recorded in the 24 hours to 8pm on Sunday, 40 per cent were in southwestern Sydney and 25 per cent were in western Sydney.

The seven-day average now exceeds 200 per day, with 1408 cases in the past week and 3634 since mid-June.

A southwestern Sydney man aged in his 90s has become the 15th person to die in the current outbreak.

He'd received one vaccine dose and was linked to an outbreak in Liverpool Hospital's aged care ward.

Some 232 COVID-19 cases are in hospital, including 54 in intensive care - 25 of whom require ventilation.

Dr Chant said zero community transmission by the end of August remained the focus for authorities, noting the vast majority of the community was doing the right thing.

She defended keeping Shellharbour in lockdown despite no cases since October, saying the area was very connected to Wollongong. There have been 13 cases recorded in Wollongong in the past fortnight.

The premier denied the emphasis on vaccinations was an admission that zero transmission was a futile cause, saying the combination of new cases and vaccination rates would dictate changes to restrictions.

About 460,000 shots were administered in NSW last week, meaning 41 per cent of the state's adult population is now at least partly vaccinated.

Dr Chant said she didn't want one dose of Pfizer wasted after questions about a nurse reportedly sacked for giving unused, soon-to-expire doses to eligible family members.

Meanwhile, about 300 Australian Defence Force troops have joined NSW police patrolling streets in Sydney's west and southwest to ensure COVID-19 health orders are being observed in eight hotspot areas.

Strathfield South Public School in Sydney's west is closed and all staff and students are self-isolating after a COVID-19 case.

Sydney public transport services have been restored to a regular weekday timetable to avoid overcrowding as the construction industry resumes with limitations after a two-week hiatus.

Tradies from the eight worst affected local government areas in Sydney's west and southwest are still not allowed to work or leave their area.

© AAP 2021

NSW has recorded 207 new local COVID-19 cases as vaccinations remain a focus for authorities trying to forge a path out of lockdown.

At least 72 cases were in the community during part or all of their infectious period, with the infection status of another 46 cases currently unknown.

"It is really in our hands as to how we deal with the cases coming down as a community but also our rate of vaccinations," NSW Premier Gladys Berejiklian said on Monday.

"One learning we have had in the last five weeks is that the vaccinations, both vaccines, are working extremely effectively.

"We still don't know of anybody in intensive care who has received both doses of the vaccine."

There are 232 COVID-19 cases in NSW hospitals, with 54 people in intensive care, 25 of whom require ventilation.

A man aged in his 90s, who had one dose of the AstraZeneca vaccine, died in Liverpool hospital.

He is the 15th death since the outbreak began in mid-June.

Meanwhile, Australian Defence Force troops have joined NSW police patrolling streets in Sydney's west and southwest to ensure COVID-19 health orders are being observed in the hotspots where the virus is surging.

About 300 ADF troops are reinforcing the efforts of police, patrolling and doorknocking to ensure people are complying with self-isolation and stay-at-home orders in eight Sydney local government areas.

The military support was requested by Police Commissioner Mick Fuller on Thursday when NSW reported a record 239 COVID cases - a figure that was matched again on Sunday.

Strathfield South Public School, in Sydney's west is closed after a COVID-19 case in the school community.

The school's website says contact tracing and deep cleaning is underway while all staff and students must self-isolate until they receive further advice.

Sydney public transport services have been restored to a regular weekday timetable to avoid overcrowding as the construction industry resumes with some limitations, after a two-week hiatus.

Tradies from the eight worst affected local government areas in Sydney's west and southwest are still not allowed to work or leave their area.

NSW Health's Dr Jeremy McAnulty said there were multiple aged care facilities across Sydney where staff and residents had been infected including nine residents at an aged care facility in Summer Hill in the city's inner west.

© AAP 2021