Victoria has achieved 51 days without a case of community acquired coronavirus as the state border with NSW has tightened further.
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The Department of Health and Human Services' daily update revealed two internationally acquired COVID-19 cases in quarantine, with 12 active cases statewide.
On Saturday, 9771 test results were received by DHHS.
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On Saturday night, the state announced anyone from NSW's Central Coast who enters Victoria or has already entered, after visiting the region, would be required to be tested for coronavirus and isolate until they receive a negative result.
The NSW Central Coast is in the state government's 'orange zone', which previously included the Greater Sydney area, but has extended to the Central Coast.
NSW recorded 23 cases of community transmission last Saturday, with 21 of those traced to the Northern Beaches outbreak.
Residents of the Northern Beaches local government area were put in lockdown from 5pm Saturday.
Authorities are also looking to expand the "red zone", which currently covers the Sydney Northern Beaches area, denying entry to visitors from there.
An additional 23 cases were diagnosed in NSW in the 24 hours to 8pm on Friday, taking the northern beaches outbreak to 40. More cases are expected to be announced later on Sunday.
Victorian contact tracers have been racing to protect the state's hard-won gains against any virus spread from recent Sydney travellers.
Health officials have identified 70 primary close contacts of positive cases and they are now in quarantine.
The government said on Saturday evening it had sent more than 27,000 text messages to people who had flown into Victoria from NSW between 11 and 17 December.
Flight manifests have identified 321 people from the northern beaches area, and contact tracers have called 305 of those.
Testing sites have been set up at terminals one and four at Tullamarine airport. Masks are also mandatory in airports.
Victorian Health Minister Martin Foley flagged serious concerns that the virus had spread.
"We remain extremely concerned about the outbreak in NSW and the likelihood that it has seeded beyond the northern beaches," Mr Foley said on Saturday evening.
NSW Premier Gladys Berejiklian said NSW virus cases were expected to increase by the same number again on Sunday, or by more.
-with AAP
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