A third person has tested positive to COVID-19 in Queensland in the last 24 hours.
The woman, 22, is an employee of YMCA Chatswood Hills Outside School Hours Care in Springwood, south of Brisbane.
Both the school care service and the associated Chatswood Hills State School have been closed for cleaning.
Queensland Health said the case is linked to two 19-year-old women with coronavirus who are accused of lying on their border declaration forms and dodging quarantine to enter Queensland.
The pair, who flew back from Melbourne via Sydney on July 21 after travelling together, were active in the community for eight days before isolating.
Health authorities have urged anyone who visited 11 locations in Queensland to ‘immediately self-quarantine and contact 13 HEALTH’:
Shopping centres, restaurants, a school, and a church they visited will shut while authorities scramble to conduct contact tracing.
Scores of the women’s contacts will be forced to isolate, and aged care facilities in the Metro South Health region will re-enter lock down as the state tries to avoid an outbreak.
It prompted Queensland Premier Annastacia Palaszczuk to announce all Sydneysiders will be banned from entering the state from Saturday.
Queensland residents returning will have to isolate in a hotel for 14 days at their own expense.
Queensland Chief Health Officer Dr Jeannette Young called the pair ‘reckless’ and said she was ‘very disappointed’.
The teens travelled on flights VA 863 and VA 977. Queensland Health contact tracers are identifying close contacts from those flights.
Health Minister Steven Miles said there was a large amount of contact tracing that needed to be done with the community as well.
‘These young women have gone about their business within the communities that they live in and so there will be a large amount of contact tracing to be done, largely within it the Logan and Springfield areas, including shopping malls, restaurants and a church.’
One of the women attended the Orion Springfield Central in Ipswich, south-west of Brisbane, on Sunday where she dined at the Peak Thai restaurant about 6.30pm.
There are now eight actives cases left in Queensland following three new cases on Wednesday.