Queensland has recorded three new virus cases confined to the cluster in Brisbane's west in positive news for residents locked down in the far north.
Premier Annastacia Palaszczuk said each of the new cases had been in quarantine for their entire infectious period.
It's encouraging news for Cairns with no confirmed spread from a taxi driver linked to an earlier Delta variant case involving a local marine pilot.
More than 4200 tests were recorded in the city in the past 24 hours.
"It's very encouraging to see Cairns residents coming out and getting tested," Ms Palaszczuk said on Tuesday.
The unvaccinated cabbie was infectious in the community for a total of 10 days, seven of them spent driving passengers around Cairns.
Health authorities believe the pilot caught the virus after working on a ship on July 23.
"That taxi driver took the pilot to the airport on the 26th of July and we know through whole genome sequencing that those two are linked," Chief Health Officer Jeannette Young said on Tuesday.
"That was before we thought he was infectious which is why he wasn't picked up on contact tracing, but we're now going back further."
Residents of Cairns and the Aboriginal community of Yarrabah are currently subject to a three-day lockdown, which is due to end at 4pm on Wednesday if there's no sign of further infections.
At the opposite end of the state, authorities are on alert after communities in northern NSW went into lockdown.
The Byron Shire, Richmond Valley, Lismore and Ballina Shire local government areas went into a snap lockdown at 6pm on Monday after a positive case from Sydney travelled to Byron Bay.
Ms Palaszczuk warned against Queenslanders travelling to the hotspot regions south of the border.
"We do not want to see mass movement happening there at all," she said, flagging an increased police presence at the border.
Chief Medical Officer Jeannette Young said the man was infectious in the community from July 31 and anyone in Queensland who had been in the affected NSW LGAs was now bound by the same lockdown restrictions.
"Anyone who has been in those four LGAs, and they've gone anywhere else, out of those four LGAs is, whether in New South Wales, or in Queensland or indeed anywhere else now needs to stay at home except for those four reasons," she said.
NSW has reassured Queensland the man who triggered the lockdown was not in the state at any point during his infectious period.
Dr Young outlined Tuesday's cases as a student at Brisbane Boys Grammar who tested positive on day eight of quarantine, a student at Ironside State School who tested positive on day seven and a household contact who tested positive on day nine.
"I know how tough this must be for all of those people in home quarantine, but it's really important that they maintain it for the full 14 days since they've been last exposed to an infectious person," Dr Young said on Tuesday.
Across the state, more than 13,000 people are currently in home quarantine.
