There are fears a gastroenteritis outbreak caused by contaminated oysters in Tasmania over the Easter weekend has spread interstate.
Tasmania's Department of Health and Human Services has confirmed more than 60 Tasmanians have gastroenteritis after eating oysters traced to Barilla Bay Seafoods and grown at Dunalley in the state's south.
A spokesman for the department confirmed on Wednesday that the contaminated oysters were also sold in Melbourne and Sydney.
It is believed that up to 20 people in Melbourne have reported the illness, however tests have not yet confirmed if is linked to the Barilla Bay oysters.
"There are reports of Victorian people having gastro," the spokesman said. "There is a smoking gun but as yet there is no direct link proved by testing at this stage."
Barilla Bay Seafoods halted the sale of its oysters on Sunday pending investigations and all potentially contaminated shellfish have been removed from the market.
The contamination is not believed to be related to a sewage spill at nearby Pitt Water and Island Inlet which forced the closure of several leases last week.
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