Is that an acceptable risk for the sake of international travel? If community transmission is almost non-existent, our only real exposure is and would be from overseas travellers. Despite our strict quarantine measures, there are still occasional cases (connected with overseas travellers) so imagine what it would be like if we had open borders with no or limited quarantine.
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Scott Morrison has warned Australians will need to prepare for “1000 COVID cases a week” if he reopens the international borders prematurely.