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Victoria & Queensland Record Double Digit COVID Increases As Concern For NSW Grows

Victoria has recorded 21 new locally acquired coronavirus cases, including four mystery infections.

The health department on Thursday confirmed 17 of the new cases are linked to known outbreaks, while 15 were in quarantine during their infectious periods. Two cases were also reported as interstate acquired.

Some 45,408 tests were processed in the 24 hours to Thursday morning, while 25,418 Victorians were vaccinated at state-run hubs.

It comes after Melbourne's lockdown was extended by a week, in part due to the discovery of five cases of unknown origin, also known as mystery cases, on Wednesday. There are more than 13,800 close contacts isolating, while the number of exposure sites has surged to almost 350.

The virus cluster in Brisbane's west has increased by 10 cases as authorities urge Queenslanders not to cross into NSW with more communities going into lockdown south of the border. All of the new cases have been in quarantine during their entire infectious periods and Premier Annastacia Palaszczuk said she expected similar case numbers in coming days.

More than 15,000 Queenslanders are currently in home quarantine.

"Just because you receive a negative test does not mean you can leave your home," Ms Palaszczuk said.

With more evidence of COVID-19 spreading in regional NSW, health authorities have reinforced calls not to cross the border.  "We are very, very concerned about the situation in NSW," Ms Palaszczuk said.

AAP with The Project