A man who lives in Sydney's eastern suburbs has been diagnosed with Covid-19.
NSW Premier Gladys Berejiklian says the man in his 50s has not recently travelled overseas and does not work in a hotel quarantine, border or a health role.
He was tested yesterday and the positive result was recorded today.
NSW Health contract tracers are urgently working to identify any contacts.
Chief Health Officer Kerry Chant said the man is believed to have been infectious since last Friday.
Genome sequencing is underway, with results expected in the next 24 hours.
He has a number of close contacts who were being tested and were isolating, Chant said.
He visited a number of venues while potentially infectious, she said.
People can currently travel to Australia from New Zealand without having to undergo a Covid-19 quarantine stay on either side of the Tasman.
In a statement this evening New Zealand's Ministry of Health said the public health risk to New Zealand was low.
It said at this stage it did not recommend any change in quarantine-free travel between the two countries.
Anyone in New Zealand who had been at any of the locations of interest at the specified times should contact Healthline, self-isolate and get a test.
Individuals in Australia who were at a location of interest at the specified times should follow NSW health advice regarding isolation and testing, the ministry said.
It would be requesting airlines provide this message to anyone flying to New Zealand from NSW in the next 24 hours.