LATEST COVID-19 DEVELOPMENTS:
* Melbourne's COVID-19 outbreak now has 15 cases, with six extra infections confirmed on Wednesday morning.
* The number of exposure sites has grown from 10 to more than 50 and includes the MCG.
* Acting Victorian Premier James Merlino says the next 24 hours will be critical to avoid another lockdown.
* The city's residents have returned to mandatory indoor masks and beefed up gathering restrictions.
* A report into how the Victorian man at the centre of the cluster caught the virus while in hotel quarantine in Adelaide was released on Wednesday, finding transmission had occurred between two rooms at the end of a corridor.
* South Australia has slammed shut its border for any travellers from Greater Melbourne.
* Queensland will turn away travellers from the City of Whittlesea from Thursday, and has warned the state's residents to avoid travel to Victoria.
* The NSW government is also advising people against travelling to Melbourne and Bendigo for the time being.
* The outbreak has intensified criticism of the federal government's vaccine roll out, with Labor urging the government to redraft vaccination plans and scrap its staggered program.
* States have already begun offering jabs to cohorts of people outside the recommended stages.
* Prime Minister Scott Morrison has accused Labor of being "whingers and complainers" for questioning the rollout, claiming voters stop him in the street to say how well Australia has done compared to other countries.
* Government MPs on Wednesday urged all eligible Australians to get vaccinated against coronavirus as the fresh outbreak threatens to spread across Melbourne.
* All Victorian-based AFL clubs have been forced into lockdown as the state deals with the fresh COVID-19 outbreak.
* Acting Victorian premier James Merlino said AFL games - including a blockbuster top of the table clash - would go ahead with crowds in Melbourne, but that could change if the outbreak worsens.
* Several sporting teams within the AFL and Super Netball League are rushing to get out of Melbourne as case numbers grow.
AUSTRALIAN VACCINATION NUMBERS:
* There were 3,795,280 doses administered in the national COVID-19 vaccination rollout up to Monday, including 104,658 in the previous 24 hours.
* Of the total, 2,452,469 have been administered by the Commonwealth (an increase of 60,887 in the previous 24 hours).
* 2,119,443 have been issued in primary care (+57,921) and 333,026 in aged and disability facilities (+2966).
* 1,342,811 have been administered by the states and territories, including 43,771 in the previous 24 hours.
* 385,320 have been administered in Victoria (+15,816), 371,117 in NSW (+13,200), 198,598 in Queensland (+5596), 154,879 in Western Australia (+3156), 97,327 in South Australia (+2966), 60,801 in Tasmania (+1134), 45,324 in the ACT (+810) and 29,445 in the NT (+1093).
AUSTRALIAN CORONAVIRUS NUMBERS:
* Australia reported ten new locally acquired virus cases on Wednesday, all in Victoria.
* There were five new overseas-acquired cases in hotel quarantine; two in South Australia, two in NSW and one in Queensland.
* 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 167,856,000
* Deaths: at least 3,486,000
* Vaccine doses administered: at least 1,709,440,00.
Data current as of 1730 AEST on May 26, taking in federal and state/territory government updates and Johns Hopkins Coronavirus Resource Centre figures.