Victorian health authorities have revealed concerning details about "stranger to stranger" transmission of COVID-19 that sent the state into a snap seven-day lockdown.
COVID-19 testing commander Jeroen Weimar singled out Melbourne shopping centres as venues of most concern where transmission may have occurred through "very fleeting contact".
"They don't know each other's names. That's very different to where we have been before," Mr Weimar said.
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Queues build at a pop-up COVID-19 test site at Albert Park Lake in Melbourne.(Daniel Pockett / Getty Images)
"What we're seeing now is people are brushing past each other in a small shop, they are going to display home, they are looking at photos in a Telstra shop.