Genomic sequencing has revealed that the part-time cleaner in her 20s at one of Brisbane's quarantine hotels that tested positive for the highly infections mutant United Kingdom strain of COVID-19.
Queensland's first community Covid-19 case in 113 days has sparked a three-day lockdown for greater Brisbane.
"We've got to act before we get the cases", said the chief health officer of Queensland, Jeannette Young.
"What we are seeing in the United Kingdom and other places around the world is high rates of infection from this particular strain", she said.
Worldwide air crew must undergo a Covid-19 test in Australia every seven days or on arrival and will need to quarantine in dedicated quarantine facilities between global flights or for 14 days.
She said one returned traveller from the United Kingdom has shown remnants of the virus, with alerts being issued for venues visited by the case in case of any possible transmission into the community.
The woman, who is in her 20s and lives in Algester in Brisbane's south, developed symptoms yesterday and got tested - though health authorities believe she has been infectious since January 2.
New South Wales Health Minister Brad Hazzard said the state remained on "high alert" due to an increasing number of quarantined travellers testing positive for new variants of COVID-19.
Medical experts will present a detailed report on the United Kingdom virus which is 70 per cent more infectious than other strains.
A Central Queensland duo has nothing but praise for airline staff who got them back in the air just hours after arriving at Brisbane on Friday morning.
IPSWICH residents are already stocking up on masks following news they are a mandatory part of the newly-imposed lockdowns across Ipswich and greater Brisbane.
The three-day lockdown prompted panic buying on Friday as massive crowds flocked to supermarkets stripping shelves of toiletries, perishables and canned goods with lines stretching for hundreds of metres at some stores.
Mr Barr also indicated that the new restrictions would essentially keep worldwide students away from Australian universities for the foreseeable future despite initial hopes they would be able to return for semester one.
A worker at a quarantine hotel tested positive for the variant on Thursday.
"We will be reducing, till the 15th of February, the caps on worldwide arrivals in New South Wales, Western Australia, in Queensland, by 50 per cent", the Prime Minister said.
It comes after a woman, identified as having the highly contagious United Kingdom strain of the virus, returned a result showing remnants of the virus.
Any passengers who plan to travel beyond Queensland to another state will need to check state and territory travel restrictions and ensure they have the appropriate exemptions and approvals to travel.
"We haven't had community transmission in Ipswich yet so let's hope it stays that way".