A Canberra woman in her 70s contracted coronavirus in Indonesia, ACT health authorities say.
The woman tested positive to the virus on Tuesday night and is the ACT's third confirmed case.
She has been released from Canberra Hospital and is in self isolation.
It came as Chief Minister Andrew Barr released more detail about the government's upcoming stimulus package, targeting businesses most affected by the social isolation measures brought in to stem the virus.
ACT chief health officer Dr Kerryn Coleman said the woman was travelling back to Australia while infectious.
The woman travelled on Garuda Airlines flight GA712 between Jakarta and Sydney on Saturday, March 14, which landed in Sydney at 9.30am.
Anyone on that flight seated in rows 41 to 45 is considered a close contact and health authorities have urged those in those rows to self isolate.
Other passengers on board were advised they were not at an increased risk of exposure.
The woman then got on a Murrays bus between Sydney Airport and Canberra.
The bus left the airport on March 14 at 12.25pm.
Health authorities say they're working with Murrays to get a list of passengers who were on the bus.
"The individual wore a mask on the bus, but we still believe there is a small risk of exposure to those on the bus during travel," Dr Coleman said.
"We're asking people to quarantine themselves and get in touch."
Work is under way to determine where the woman was exposed to the virus and follow up with close contacts.
It came after two men in their 30s were diagnosed with the virus in the ACT.
There have been more than 1500 negative tests to the virus in the ACT.
Mr Barr said the first stimulus package, which was expected to be finalised and announced later this week, would give targeted relief to industry sectors almost entitled wiped out by the social distancing measures recently announced.
He flagged rates and payroll tax relief for businesses, and the loosening of some regulatory fees and rules.
"Our focus will be on utilising our existing channels, our existing payment mechanisms and fee collection mechanisms, not inventing new programs in the short term," Mr Barr said.
He said the economic response would have at least three stages with flexibility to move in between those stages if needed.
While the package will provide some relief to individuals, businesses will be the main target.
Minor infrastructure projects will also be a focus, including ramping up maintenance and repair works.
"One of the things that will keep people out of difficulty is having an income, having a job," Mr Barr said.
"So we do need to support businesses at this point.
"We don't have a bottomless pit of money, I'm not going to waste money on frivolous projects. We've got to make sure the money that we spend delivers an outcome for the community, that is both an employment outcome, but also gets something meaningful done."
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