Contract tracers are working against the clock to track the source of three new coronavirus infections in New South Wales.
A Wollondilly man in his 50's, a Camden woman aged in her 50's and a woman in Parramatta in her 50's have all tested positive for Covid-19.
Even those with even the mildest of symptoms are being urged to get tested.
Affected venues are listed on the New South Wales Health website.
The new cases threaten to delay the reopening of the New South Wales Queensland border on November 1.
The Queensland government has given NSW 48 hours to find the source of the three new cases otherwise the countdown clock will re-start, as Queensland insists NSW must go 28 days without a single community case.
WA has applied the same 28-day benchmark and there's speculation it could keep its border closed until April.
NSW Premier Gladys Berejiklian has chided her counterparts in Queensland and Western Australia for their "blinkered views" and unyielding border restrictions.
Ms Berejiklian has told Sydney radio station 2GB she's is furious, saying "unrealistic expectations like that are not fair ... and it's just not the right thing to do".