Just one traveller who returned to Australia on board a repatriation flight from India has tested positive for coronavirus.
The person has been placed in isolation at the Howard Springs quarantine site on the outskirts of Darwin.
Northern Territory acting chief health office Charles Pain warned other passengers from the flight were undergoing further testing and the number of cases could rise.
"I have news this morning that probably only one - they're still subject to further testing - but only one person has tested positive in that group," Dr Pain said on Monday.
"So the testing that was done in India has clearly been effective and has had the effect that we intended, which was that people wouldn't come on the flights if they were positive."
Passengers booked onto the charter flight were required to return two negative tests before boarding.
About half of the 150 passengers were turned away after testing positive or being deemed close contacts of positive cases.
Dr Pain acknowledged being blocked must be "desperately disappointing" but said health authorities were working to get those who tested positive onto future charter flights.
"It's expected that they will re-join the testing queue, or the queue to get on those flights, as soon as possible," he said.
"It's expected that some of those people who tested positive will return negative tests (next time)."
