Sydney could be in lockdown for a while yet.

New South Wales has 145 new cases of Covid-19 -- 51 infectious while in the community.

There's speculation the Australian state will come out of lockdown on September 17.

But, International Correspondent Oliver Petersen told Heather du Plessis-Allan that Christmas looks more likely.

He says people aren't getting the message to stay home.

Both South Australia and Victoria are expected to come out of lockdown at 11.59pm tomorrow night.

Meanwhile, Queensland has one new community case.

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