Queensland has recorded nine new community cases of COVID-19, the greatest increase in cases in 12 months for the state.
The latest figures come after a snap lockdown was announced on Saturday following a high school student testing positive for the virus earlier this week.
All community cases detected so far have been the highly infectious Delta variant of COVID-19, with health officials stressing they need to "move quickly" if they want to bring the outbreak under control.
The new restrictions are the strictest lockdown the state has seen to date and apply to 11 local government areas (LGAs). The lockdown came into effect at 4pm on Saturday and will last until at least Tuesday.
Queensland chief health officer Jeannette Young said it was vital anyone with "any symptoms at all" come forward to get tested as authorities seek to find the cause of the new outbreak.
"I don't know where this virus is at the moment," Dr Young told media on Friday.
"Please come forward. Because then we will be able to find those other chains of transmission which I expect are out there."
Health officials said a total of 11,468 tests were carried out in the past 24 hours, but they were hoping to get those numbers up.
"Our testing numbers are not high enough," said Queensland Health Minister Yvette D'Ath.
"We cannot be complacent, we want more people coming out of testing. We will be putting out on many social media platforms today, where you can find testing sites in your local area."