A Queensland woman who tested positive for COVID-19 at a private laboratory has since returned two negative test results, meaning the case has now been declared a false positive.
The 68-year-old Ipswich woman was believed the state's sole new case on Wednesday, but after two further tests conducted by Queensland Health, she was struck off the state's total on Thursday evening.
Premier Annastacia Palaszczuk said a serology test, which is used to search for antibodies in the blood and tell whether a patient was previously exposed to COVID-19, came back negative.
It came after a follow-up PCR test - which identifies whether the patient is currently carrying the virus - ordered by Queensland Health, was also negative.
Ms Palaszczuk said the only positive result for the woman was a PCR test carried out by a private pathology laboratory ordered by the woman's GP.
There were concerns surrounding the woman's initial positive result because contact tracers could not trace the source of her infection and so Queensland Health ordered the two follow-up tests.