LATEST COVID-19 DEVELOPMENTS:
* Victoria entered day one of its fourth coronavirus lockdown on Friday, with four new cases and contact tracers focusing on five Melbourne exposure sites.
* People infected in the outbreak have the B1617 strain of the virus, first identified in India, which authorities believe could be 50 per cent more transmissible than other variants.
* The state has asked the federal government for 160 Australian Defence Force staff to help doorknock positive cases and primary close contacts, as 15,000 people self-isolate.
* The federal government has confirmed it will not provide any financial support to businesses affected by the lockdown, which is expected to deliver a $2.5 billion hit to the Victorian economy.
* A record number of people have lined up for COVID tests in Victoria, with 47,462 administered in the 24 hours to Friday morning. Health workers have also administered more than a million vaccines, with 17,223 jabs delivered over the same period.
* Health Minister Greg Hunt has defended Australia's sluggish vaccine rollout, with the federal government under fire due to the lockdown. About 500,000 people have been fully vaccinated, despite plans to administer four million jabs by March.
* Australian scientists have developed a new test for COVID-19 that can return results in five minutes, and could be capable of screening thousands of people per day.
* The top-of-the-table Friday night clash between Western Bulldogs and Melbourne will go ahead after Demons staff and players all received negative COVID-19 test results.
* The AFL is working through contingency plans for a rejigged round 12, with the Richmond-Essendon 'Dreamtime at the G' match expected to be in Perth.
* Melbourne Storm have shifted their next home game to Queensland, while NRL boss Peter V'landys says the opening State of Origin match is unlikely to go ahead at the MCG.
AUSTRALIAN VACCINATION NUMBERS:
* There have been 4,031,539 doses administered in the national COVID-19 vaccination rollout up to Thursday, including 124,871 in the previous 24 hours.
* Of the total, 2,594,241 have been administered by the Commonwealth (an increase of 71,477 in the previous 24 hours).
* 2,252,603 have been issued in primary care (+67,066) and 341,638 in aged and disability facilities (+4,411).
* 1,437,298 have been administered by the states and territories, including 53,394 in the previous 24 hours.
* 421,634 have been administered in Victoria (+23,625), 397,644 in NSW (+13,588), 212,129 in Queensland (+7,257), 161,862 in Western Australia (+3530), 102,295 in South Australia (+2849), 63,293 in Tasmania (+768), 46,912 in the ACT (+828) and 31,529 in the NT (+949).
AUSTRALIAN CORONAVIRUS NUMBERS:
* Australia reported 11 new virus cases on Friday.
* There were seven new overseas-acquired cases in hotel quarantine; two in Queensland, three in NSW and two in Victoria.
* Four new local cases were reported in Victoria.
* 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 168,970,000
* Deaths: at least 3,511,000
* Vaccine doses administered: at least 1,775,485,000.