A coronavirus outbreak on Sydney’s northern beaches is the source of a Victorian mystery case, but authorities still don’t know how a Melbourne man caught it.

Genomic sequencing confirmed the man, who attended Boxing Day sales and the second day of the Test at the MCG, is linked to the NSW cluster.

The man hadn’t been to NSW or any high-risk exposure sites in Victoria,

Contact tracers are trying to establish whether there is a link to that mystery case and the 27 others from the Black Rock cluster, which has plunged 2600 primary and secondary contacts into self-isolation.

“It’s from Sydney. Exactly how it got from Sydney to here, that is less clear. But it’s exactly the same strain as NSW authorities are battling now,” Premier Daniel Andrews said.

The Vermont South man in his 30s is feared to have caught the virus either at Chadstone Shopping Centre on Boxing Day or the MCG Test the day after, with the venues deemed possible acquisition sites.

Authorities have contacted 1700 of the 8000 patrons registered in zone five of the Great Southern Stand of the MCG.

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They’ve been asked to get tested and isolate until they return a negative result.

The same advice has been given to shoppers who went to 11 Chadstone stores, including the newly-added retailer Zara, from 6am to 2pm on Boxing Day.

Mr Andrews returned from leave on Thursday, ahead of a national cabinet meeting of state and federal leaders on Friday.

The rollout of coronavirus vaccines – now set to begin in mid-February – is on the agenda along with potential changes to international travel rules amid the threat of a more infectious variant of coronavirus out of the UK.

AAP

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