The head of Tasmania's peak medical body says we should look to Victoria as a lesson for what could happen here, as COVID-19 restrictions continue to ease.
As of lunchtime Wednesday Victoria had recorded 134 new coronavirus cases, as five million people in the state prepared to enter lockdown for another six weeks.
It brings Victoria's total number of cases to 2942, of which about 850 remain active.
On Wednesday Premier Peter Gutwein announced that from midnight tonight, Victorians will be unable to enter Tasmania without an exemption.
Australian Medical Association state president Dr Helen McArdle said Tasmania needed to remain very cautious around opening borders.
"I think the message is, or should be - look to Victoria. Look at what's happened," she said.
"If we can't learn from that, we've got a problem. Because it wasn't necessarily just the easing of restrictions.
"It was more about exposure ... if you do have large gatherings, and if people aren't cautioned about social distancing, and they don't take the hygiene measures, then this could happen.
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"From our perspective it's probably a good lesson. I think everybody is very nervous. Not just Tasmania, I think the whole of Australia is very nervous."
The government had planned on reopening the state's borders on July 24, subject to Public Health advice.
However, Mr Gutwein also announced on Wednesday that this would now not include Victoria.
Dr McArdle said it was highly likely Tasmania would experience more cases of COVID-19 when interstate travel resumed.
"I think if the outbreak in Melbourne continues at the level it is continuing, then it is likely that even with quarantining, that there might be some cases here," she said.
"But it's unlikely there will be a lot, especially if there continues to be restrictions.
"To date, it has been international arrivals who have been the main risk. Now of course, with the community spread in Victoria, it could be anybody,
"But provided there are strict controls put in place ... we should be able to detect cases and therefore, manage them and manage contact."
Tasmania's last new case of COVID-19 was on May 15 and there has been no active cases in the state since June 12.
There has been growing industry pressure for borders to reopen to help boost the economy amid record job losses.
Dr McArdle said it might be possible to open borders to other states and territories, except Victoria, until the outbreak was contained.
"It doesn't have to be an all or one situation," she said.
"Most other states, even NSW, have been able to contain the number of cases and largely restrict them to returning travellers.
"So by opening up to other states, it would enable the economy to start growing again. And also, help with people with family interstate and things like that."