The Gold Coast could be subject to tighter restrictions after an Uber driver in his 50s tested positive for COVID-19 after being infectious in the community for three days.
The fully-vaccinated driver is one of two new cases reported on Thursday, with a teenager from the Scenic Rim town of Beaudesert - linked to an existing cluster - also testing positive.
Authorities are most concerned about the man from the Gold Coast as the source of his infection is a mystery, and the case follows another unlinked infection recorded this week.
There has been concern about the vaccination rate in the region, and Premier Annastacia Palaszczuk said residents should consider wearing masks where social distancing is possible.
"We just don't know where these cases have come from," Ms Palaszczuk said, flagging the possibility of tighter restrictions if more unlinked cases develop.
The advice comes less than a day after the state reached the 80 per cent target for first vaccine doses, and mask restrictions relaxing as a result.
The second case was also infectious for two days in the town of Warwick and less than a day in Beaudesert, and is linked to the Moree cluster.
The state recorded one additional case in hotel quarantine.
