The first three cases in the Victorian outbreak are all linked with a transmission event that probably happened at the Smile Buffalo Thai restaurant at Black Rock on December 21.
Authorities suspect a Victorian traveller who had returned from Sydney was the likely source of the infection. That person is still in Victoria and has been tested for coronavirus. Their result was still pending on Thursday evening.
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As Melburnians queued for hours to get tested, the Andrews government closed the border to NSW, reintroduced mandatory mask-wearing indoors from 5pm on Thursday and simultaneously reduced the maximum number of people permitted to gather in a home from 30 to 15.