Queensland will close its border to all of New South Wales and the ACT from Saturday after the state recorded one new case of coronavirus overnight.
Queenslanders who return after travelling there will be sent to mandatory hotel quarantine for 14 days at their own expense.
Premier Annastacia Palaszczuk said the state “cannot risk a second wave”.
“We have to act decisively,” she said. “We have to put Queenslanders first.”