Victorians are contracting coronavirus despite "very fleeting contact" with known cases, authorities say.
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Victoria recorded three new COVID-19 cases on Tuesday - the fifth day of the state's seven-day "circuit breaker" lockdown - bringing the latest outbreak to 54 active infections.
Health Minister Martin Foley confirmed two of the new cases are close contacts of people who have already tested positive and have been self-isolating.
The remaining case is under investigation.
"They are not a known contact and are not directly linked to any exposure site," he told reporters on Tuesday.
The state's COVID testing commander Jeroen Weimar said the man lives near Stratton Finance in Port Melbourne, where a number of positive cases worked.
"He has exposure in the number of coffee shops around there also frequented by Stratton Finance employees ... that appears to be enough to get the infection across," he said.
Mr Weimar said there have been at least four instances of "stranger to stranger transmission" in this outbreak.
"People are brushing past each other in a small shop, they are going to display homes, they are looking at phones in a Telstra shop," he said.
"This is very, relatively speaking, fleeting contact. They do not know each other's names and that is very different from what we have seen before."
Mr Weimar urged anyone who visited busy shopping centres listed as exposure sites, including Craigieburn Central Pacific Epping, Epping North shopping centre and Broadway Reservoir, to get tested.
He said there was possible exposure at Bay St shopping strip in Port Melbourne and Clarendon St in South Melbourne.
There are more than 300 exposure sites across the state and 4800 primary close contacts linked to the outbreak, with 75 per cent of those returning a negative test.
Meanwhile, the Victorian government has announced all aged care and disability workers will soon be able to jump the queue at mass vaccination centres.
Express lanes will be opened for aged care and disability workers from Wednesday to Sunday at 10 of the state's vaccination centres. Ballarat's Mercere Hotel and Convention Centre is one of those venues.
The lanes will operate from 9am to 4pm and workers will need to show proof of employment.
Minister for Disability, Ageing and Carers Luke Donnellan said the five-day blitz would ensure more workers in vulnerable settings are protected.
"This is about stimulating that demand and getting more workers to get greater coverage at the private aged care sector and the disability sector," he said.
"We have concerns there isn't enough coverage that is why we are stepping in."
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The move comes after two workers at Arcare Maidstone, an aged care facility in Melbourne's northwest, and a 99-year-old resident tested positive.
The resident, who was taken to hospital for treatment, received just one dose of the Pfizer vaccine.
One of the workers also received a dose but the other, who also worked shifts at BlueCross Western Gardens in Sunshine from Wednesday to Friday, has not.
Both facilities have been locked down as all staff and residents are tested. There have been no additional cases so far.
Some 42,699 Victorians were tested in the 24 hours to Tuesday morning, while 20,484 were vaccinated.
Mr Foley said it is too early to say whether the state's lockdown will end as planned at 11:59pm on Thursday.
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