Queensland has recorded no new COVID-19 cases as health authorities ramp up testing in Townsville after traces of the virus were detected in local sewage.
Testing of wastewater turned up traces of coronavirus for the first time on Saturday, with authorities saying it was a concerning development.
Deputy Premier Steven Miles said health officials had tested more than 100 people in the northern city over the weekend.
"We continue to urge people in Townsville to go and get tested," he told reporters on Sunday
Mr Miles previously said Townsville Hospital and health officials would increase testing rates in a bid to work out if there was a case or cases in and around Townsville.
Queensland Health completed more than 2400 COVID-19 tests across the state in the 24 hours to Sunday morning.
Four cases remain active.
Chief Health Officer Jeannette Young previously said the situation in Townsville was worrying considering the city hadn't reported a case for many weeks.
"This is in Townsville where we know we haven't had cases in quite some time," she said.
Dr Young said anyone feeling unwell should get tested so authorities have the best chance of identifying the first case if a cluster emerges.
She said it was possible that the positive result had come from someone who had previously had coronavirus and recovered but was still shedding inactive virus.
Or it could be someone with an old infection who had passed through the town, she said.
