The ACT is no longer coronavirus-free after a Canberra woman in her 20s acquired the disease overseas.
ACT Health said it did not think the woman has been infectious since returning "some time ago".
"She did everything she was supposed to do when she returned to Australia," ACT Health said in a statement.
Canberra has recorded three coronavirus deaths and 103 residents have fully recovered from the infection.
The ACT last Thursday announced it was the first Australian jurisdiction to be free of all known active coronavirus infections.
"Today marks the first time in seven weeks our territory has no active cases of COVID-19 and this is because of the strong work the community is doing to stop this virus," ACT chief health officer Kerryn Coleman said at the time.
"However, it is important to stress that we should still protect the good work we have done. Please continue to follow ACT Health directives and practise good hygiene as we continue to help fight this virus together."
The nationwide coronavirus death toll rose to 96 on Monday after Sydney's Newmarch House confirmed another resident had died.
People in Australia must stay at least 1.5 metres away from others. Check your state’s restrictions on gathering limits.
Testing for coronavirus is now widely available across Australia. If you are experiencing cold or flu symptoms, arrange a test by calling your doctor or contact the Coronavirus Health Information Hotline on 1800 020 080.
The federal government's coronavirus tracing app COVIDSafe is available for download from your phone's app store.
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