LATEST COVID-19 DEVELOPMENTS:
* Victorian authorities are more alert than alarmed by Melbourne's growing Holiday Inn outbreak, which has hit 11 cases.
* A fourth worker at the Melbourne Airport quarantine hotel and the spouses of two other staff members returned positive COVID-19 results on Thursday.
* COVID-19 testing boss Jeroen Weimar warned Victoria is in the "opening quarter" of the outbreak after Thursday's three new cases.
* The emerging cluster has prompted several states to tighten their borders to travellers from Greater Melbourne.
* Queenslanders were warned to reconsider travelling to Melbourne as the state prepares to shut its border to travellers from the Victorian capital's coronavirus risk zones.
* South Australia will push ahead with important arts and sporting events over the coming weeks despite closing the border with Victoria.
* An inquiry has been launched after a truck driver was killed when his rig slammed into the back of another truck at the main COVID-19 border checkpoint between Victoria and South Australia.
* The Northern Territory has banned the use of nebulisers at quarantine facilities, with Victoria's outbreak suspected to have been caused by the medical device.
* NSW recorded 25 consecutive days without a local COVID-19 case - three days short of the mark for "eliminating" the virus in the community.
* Six cases were detected among returned travellers in hotel quarantine across Australia. There were three in NSW, and one each in Queensland, WA and SA.
* Australia's first shipment of coronavirus vaccines has been formally approved and will arrive in the country within weeks.
* Treasury secretary Steven Kennedy has declined to predict how many jobs will be lost when wage subsidies end in less than two months.
AUSTRALIAN CORONAVIRUS NUMBERS:
* Five new locally-acquired cases were reported in Australia on Thursday, all in Victoria. Two were uncovered on Wednesday and form part of Thursday's tally, and the other three will form part of Friday's tally.
* The national death toll is 909: Victoria 820, NSW 56, Tasmania 13, WA 9, Queensland 6, 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 107,339,000
* Deaths: at least 2,354,000
* Recovered: at least 60,025,000.
Data current as of 1845 AEDT on February 11, taking in federal and state/territory government updates, Johns Hopkins Coronavirus Resource Centre figures.