A croaky-voiced NSW Premier Gladys Berejiklian says she has tested negative to coronavirus as NSW clocks 11 straight days with no recorded new cases of locally acquired COVID-19.
Ms Berejiklian is asking people in NSW to delay travelling to SA "as a precaution", as the southern state grapples with a potential second wave of coronavirus.
NSW Health said residents are now being advised to defer non-essential travel to Adelaide, and people in Adelaide should also delay non-essential travel to NSW.
The premier said NSW's borders "are completely open but if it's not essential travel think about whether you want to go in the next few days".
"We are confident that SA has it under control but we're just saying to our community ... if you can delay it for a few days unless you have to go there please do so," she told reporters on Wednesday.
NSW Health said there were seven COVID-19 cases in returned travellers in hotel quarantine in the 17,047 tests taken in the 24 hours to 8pm on Tuesday.
"If you have recently returned from Adelaide and have been to any of the sites of concern listed on the SA Health website, whether listed as "People who must quarantine" or "Monitor your symptoms", please get tested immediately, regardless of symptoms," a statement from NSW Health said on Wednesday.
Anyone who visited Adelaide on or since November 7 should minimise contact with other people until 14 days after the last day in Adelaide.
"That means avoiding contact with other households, and minimising contact at work and socially as much as possible."
NSW Health is also contacting people who recently arrived on flights from SA, and screening all new arrivals who travelled via plane and bus.
Health Minister Brad Hazzard said the latest travel advice came from Chief Health Officer Kerry Chant, who had been in contact with SA authorities.
"What we do want is people to minimise their travel. We don't want families to be separated unnecessarily and we don't want business to stop," he said.
Ms Berejiklian said she had no indication from Queensland about whether the outbreak in SA and the NSW response would affect its border with her state.
"If I did speak to them I don't think I'd get any sense ... tonight they're having 100 per cent capacity and no social distancing for their State of Origin match," she said.
Despite that, Queensland authorities had refused permission for the NSW team to go to the state a few days earlier to acclimatise, she said.
"I don't think it's based on any science," Ms Berejikilian said.
