Almost 30 per cent of international arrivals in the ACT were not tested for COVID-19 before they left hotel quarantine, the government has revealed.
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The figures come as territory health officials consider introducing mandatory testing.
Chief health officer Kerryn Coleman said a large number of children were among the 144 international travellers who chose not to be tested.
"We don't require or ask children under two to be tested if they don't have symptoms," she said.
"So I think it's quite a high acceptance rate of those returned travellers."
No international flights have arrived in the ACT for almost a month, however the territory may soon accept flights diverted from Melbourne.
ANU and University of Canberra also are trying to organise a charter flight for up to 350 international students barred from re-entering Australia because of the COVID-19 pandemic.
Chief Minister Andrew Barr said the flight needed Commonwealth approval but was slated to arrive later in the month.
The territory has so far accepted two repatriation flights - one from India which landed in May, and one from Nepal which landed last month.
About 73 per cent of passengers on the Nepal flight, and 68 per cent on the India flight agreed to be tested. In total, 144 international arrivals to Canberra were not tested.
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Testing is not mandatory for returned travellers in the ACT, but the government is now considering forcing those who refuse to stay another 10 days in hotel quarantine.
The figures are similar to testing rates of international travellers arriving in Victoria.
But in NSW, the government says just two per cent of passengers refused to be tested.
Outbreaks in Melbourne have been linked to security guards who are supervising the hotel quarantine program.
But Mr Barr said he was confident in the ACT's safety measures, saying the territory would continue to only use police and health protection officials to staff the hotel quarantine program.
Victoria has requested that all international flights are sent elsewhere for two weeks as it grapples with a dramatic surge in coronavirus cases.
Mr Barr on Wednesday said there was some potential the ACT would be asked to take a flight diverted from Melbourne. "If we are asked and there are no alternatives and those people do need to get back into Australia, then we wouldn't refuse," Mr Barr said on Wednesday.
NSW Premier Gladys Berejiklian on Wednesday said the state won't be taking any more flights, calling on the smaller states to take more.
"NSW has borne the overwhelming burden of returning Aussies on behalf of the nation, Victoria has as well to some extent," she said.
"It's fair given those diversions that other states take on those flights (to) Melbourne. It's reasonable to say to other states who've been able to live in their bubbles because we've borne the burden of these overseas travellers, 'please share in that burden, we've already done 30-odd thousand'."