The Informer: NSW, Victoria, South Australia battle coronavirus outbreaks

But the biggest question is when will the state's fifth lockdown actually end?

Premier Daniel Andrews said health authorities needed to review Monday's data before they could determine when restrictions would ease.

"I know this is not the news that people want to hear," Mr Andrews said.

Victoria's lockdown was due to end on Tuesday.

A NSW woman in her 50s has become the fifth person to die in the state from the Delta outbreak, which continues to cause chaos across Greater Sydney.

Another 98 cases were recorded in NSW on Sunday, and construction and non-essential retail was forced to close.

Of the new cases, 20 were in the community while infectious and the source of 37 infections was still under investigation .

NSW Premier Gladys Berejiklian urged families to stay home and not visit relatives, revealing most transmissions occurred within houses and workplaces.

"Be extra careful in relation to workplaces and in relation to your own family members who don't live in your household, these are two areas we need to work on," she said.

A raft of new COVID restrictions have been introduced in South Australia after an 81-year-old Adelaide man and his daughter tested positive to coronavirus.

The pair recently completed 14 days quarantine in NSW after returning from Argentina and travelled to their home in SA on July 8.

The restrictions will begin at midnight and include a ban on indoor dining, the closure of non-essential retail and the closure of gyms and indoor fitness facilities.

Masks are required in high-risk settings, public transport and shared indoor spaces.

Did you know you can receive this daily digest by email? Sign up here

THE NEWS YOU NEED TO KNOW: