I think there is a big difference between state border closures and national border closures and some on here don't seem to be able to differentiate between the two. Australia has broadly the same level of risk regardless of which state we are discussing. Using the example of the women in NZ they could have passed the virus to a worker at Brisbane airport and Brisbane would have the potential of community transmission just as any other state that has international arrivals. Closing the border to other Australian states achieves nothing unless there is a broad differential of the level of community spread between states and it would seem that all states are managing quarantine and containment measures pretty well.
International borders will be an issue until Australia has the same risk profile as other countries. Other than NZ there aren't many that match our containment level. Until they do we cannot drop quarantine measures, although there may be the opportunity to open borders whilst having compulsory quarantine if it makes sense in some instances. Not much help for tourism but business and migration might benefit.
Similarly there is the question of allowing Australians to travel overseas which is another can of worms. I'd imagine that it would be impossible to get travel insurance against Covid-19 but there are countries that Australia has a reciprocal medical agreement with such as the UK that might make outbound travel feasible. Naturally Quarantine would be necessary on return.
Regards,
Tote
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