Queensland may have avoided another COVID-19 outbreak as authorities warn the NSW border could be shut until November.
Queensland Health hasn't listed any new exposure sites in the state after two truck drivers were recorded as virus cases on Tuesday.
The pair tested initially tested positive in NSW with authorities there alerting Queensland Health about the results after they had crossed the border.
However, when the pair were retested twice in Queensland, they returned negative results for COVID-19 each time.
The pair, who live in the Sunshine Coast and Somerset regions, were deemed a low-risk and may have been false-positives.
Officials said exposure sites would be listed in St George and Balonne on Tuesday night, but none had been listed by Wednesday morning.
Balonne Shire Mayor Samantha O'Toole says the local disaster management committee believes the community is at low-risk from the virus.
"Everyone regarded as a close contact of the driver in Bollon and St George has been contacted and is in self-isolation," she said in a statement on Tuesday night.
"Balonne Shire has one of the highest COVID-19 vaccination rates of any local government area in Queensland and this incident is a reminder of the importance of coming forward and being vaccinated."
While Queensland may have avoided an outbreak, the government still sees a risk from the Delta variant outbreak in NSW.
At present only certain essential workers who have had at least one dose of a COVID-19 vaccine are allowed to cross into Queensland.
About 120 Australian Defence Force troops will arrive on the border to backup police on Wednesday.
Queensland Health has confirmed that strict border controls could remain in place until early November.
"The Chief Health Officer hopes restrictions will be in place no longer than 10 weeks, however nothing has been formalised to that effect," the department said in a statement on Tuesday.
"This is based on the timeframe in which we hope to have 70 per cent of Queenslanders fully vaccinated against COVID-19 (ie: have received two doses)."
"We regularly review restrictions and will ease or lift them as soon as it is safe to do so, however the reality is outbreaks in southern states will not just disappear over the next few weeks.
"These outbreaks are claiming lives and devastating communities.
"Until we have achieved a high vaccination rate, measures like border restrictions are unfortunately necessary to keep Queenslanders safe from incursions."
Queensland Premier Annastacia Palaszczuk is set to give a COVID-19 update later on Wednesday.
