Epidemiologists say a new COVID case from the recent New Delhi repatriation flight — which was diagnosed in Australia after two earlier rounds of testing — likely made it here due to how long it takes for the virus to become detectable.
The federal government's travel ban was implemented shortly after, mainly among Australians repatriated from India.
Download the ABC News app and subscribe to our range of news alerts for the latest on how the pandemic is impacting the world "You've got to understand that even though we have some really rigorous processes and pre-flight testing, the whole reason we have quarantine is that they're not perfect," Dr Vally said."There is going to be an ongoing risk that people who've managed to stay safe might, in fact, in the very process of getting to the airport and getting on the plane, get that infecting dose and bring that with them on the plane.