LATEST COVID-19 DEVELOPMENTS:
* Australia has now administered more five million vaccine doses, with another 88,000 issued over the 24 hours to Sunday afternoon.
* Victoria initially reported two new infections on Sunday but as acting Premier James Merlino finished his daily press conference, a further two cases emerged linked to the Arcare Maidstone nursing home.
* They involve a 79-year-old resident and an aged care worker, who remain asympomatic.
* The day's earlier cases were a worker at Stratton Finance in Port Melbourne who was isolating for the entirety of their infectious period, and a primary school teacher linked to the West Melbourne outbreak.
* The two clusters now account for 40 cases.
* As Melbourne endured its second weekend in lockdown, Mr Merlino said he still expected Victoria to be in a position to carefully ease restrictions from next Friday. "We just have to drive this into the ground," he said.
* There are more than 6000 primary close contacts across the state, although 1900 were to be released on Sunday after serving their isolation period.
* In WA it was revealed a returned overseas traveller tested positive to coronavirus on Saturday morning, a day after leaving hotel quarantine in Perth.
* Authorities believe the maritime worker is shedding viral particles and not infectious, but he has been returned to hotel quarantine as a precaution.
* Contact tracing is under way and potential community contacts will be encouraged to get a COVID-19 test as a precaution.
* The NSW government has put up its hand for a quarantine facility after locked-down Victoria secured an agreement with the Commonwealth for one last week. Queensland remains out in the cold.
* Treasurer Dominic Perrottet says NSW has done the heavy lifting and setting up a quarantine facility may assist over the next 12 months to alleviate pressure on its hotel system.
* Labor leader Anthony Albanese says government-run, purpose-built quarantine facilities need to be built now and not after the next federal election which could be as late as May next year.
* It remains voluntary for aged care workers to detail their vaccination status despite a new reporting requirement for providers to detail jab numbers.
* "The choice to get vaccinated and to disclose this information is voluntary but we do hope the workforce gets behind this important initiative," Health Minister Greg Hunt says.
AUSTRALIAN VACCINATION NUMBERS:
* There have been 5,016,352 doses administered in the national COVID-19 vaccination rollout up to Saturday, including 88,745 in the previous 24 hours.
* Of the total, 3,143,643 have been administered by the Commonwealth (an increase of 36,008 in the previous 24 hours).
* 2,768,110 have been issued in primary care (+35,665) and 375,533 in aged and disability facilities (+343).
* 1,872,709 have been administered by the states and territories, including 52,737 in the previous 24 hours.
* 613,914 have been administered in Victoria (+29,597), 499,725 in NSW (+7483), 276,199 in Queensland (+9422), 189,861 in Western Australia (+2199), 124,496 in South Australia (+1932), 75,196 in Tasmania (+1092), 54,825 in the ACT (+1012) and 38,493 in the NT (+NA).
AUSTRALIAN CORONAVIRUS NUMBERS:
* Australia reported four new locally acquired virus cases on Sunday, all in Victoria.
* There were at least 16 new overseas-acquired cases recorded in or linked to hotel quarantine: six in Victoria, five in NSW, two in Queensland, two in SA and one in WA.
* The national death toll is 910: Victoria 820, NSW 56, Tasmania 13, WA 9, Queensland 7, SA 4, ACT 3 (Two Queensland residents who died in NSW have been included in the official tolls of both states).
GLOBAL CORONAVIRUS NUMBERS:
* Cases: at least 172,871,377
* Deaths: at least 3,718,983
* Vaccine doses administered: at least 2,081,718,731.
Data current as of 1700 AEST on June 5, taking in federal and state/territory government updates and Johns Hopkins Coronavirus Resource Centre figures.