THERE have been 15 new confirmed cases of locally transmitted COVID-19 in NSW overnight, all linked to the Avalon cluster.
There have now been 83 cases in total linked to the cluster on the Northern Beaches area of Sydney.
People living in the area have turned up for COVID-19 testing "in droves", despite some delays and queues at testing facilities.
The border between NSW and Victoria is officially closed once again after Victoria Police set up checkpoints on the Lincoln Causeway this morning.
Communities across the border have been divided, less than a month since NSW lifted its border closure with NSW.
She said it was pleasing to see a downward trend in the number of cases, but this virus was particularly volatile, and contagious, and we needed to remain vigilant.
Ms Berejiklian urged people to wear masks in high risk areas, particularly at indoor settings like shopping centres and grocery stores, and on public transport.
"We already know what the high risk areas are," she said. "Don't think you're immune, this can affect anyone. We have to be as vigilant as ever."
ONE new COVID-19 case has been recorded in Victoria's hotel quarantine system.
Department of Health and Human Services data released on Monday showed the new case was acquired overseas.
There were no locally acquired coronavirus cases in Victoria for the 52nd consecutive day. There were also no further deaths.
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There are 13 active COVID-19 cases in Victoria's hotel quarantine system.
A DHHS spokesperson said 13,695 people were tested for the virus on Sunday.
It came as the Victorian government tightened the border restrictions with NSW.
From Monday, the Greater Sydney area and the NSW Central Coast will been designated as "red zones", while the Northern Beaches area of NSW has been declared a "hot zone"
That means people who live in those communities or have visited those communities since December 11 should not visit Victoria.
If passengers do arrive from a red zone or the hot zone, they will be transferred to hotel quarantine where they will be required to remain for up to 14 days.
Returning Victorian travellers from the red zone Greater Sydney or Central Coast areas will have until 11.59pm on Monday to return home, but need to enter a period of self-quarantine at home.
Those Victorian returning travellers must apply for an exemption permit on the Services Victoria website and get tested within 24 hours of returning to Victoria.
Testing sites have been established at all terminals at Melbourne Airport.
Returning Victorian travellers from the hot zone of the Northern Beaches area will not be permitted to enter Victoria.
The rest of regional NSW is designated as a "green zone" but residents from these areas will still need to apply for and receive a valid permit to enter Victoria.
People living in local government areas along the border will not need a permit, but will be able to use a valid ID with their address - like their driver's license - to travel between Victoria and NSW.
Drivers must still apply for a permit if they are a truck or freight driver, or air freight worker travelling to Victoria for work. They are not permitted to enter Victoria if they have been in a hot zone.
Victorians are strongly advised not to travel to Sydney as they may not be able to re-enter without undertaking hotel quarantine for 14 days.
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