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Health officials have also released a report which suggests aerosol transmission may have caused an infection in a Victorian man in Adelaide hotel quarantine, which ultimately sparked the Melbourne outbreak.
With 15 confirmed infections in Melbourne, SA will only allow essential workers and returning South Australians to cross the border, but they must get three virus tests and isolate for 14 days.
Anybody from Greater Melbourne who travelled to SA since 20 May must also get tested and isolate until they receive a negative result. Our thoughts are with everybody in Melbourne. Any outbreak is something we need to take extraordinarily serious, Premier Steven Marshall said.
An infectious drinker who enjoyed a mammoth Saturday night party session may plunge Melbourne into another snap lockdown, with an announcement due on Thursday morning.
The Covid-19 outbreak in Melbourne could have been spread interstate after health authorities confirmed a virus carrier attended sporting fixtures involving a New South Wales team.