South Australia remains on track to ease coronavirus restrictions before Christmas but health officials say this week is crucial in combating a cluster of COVID-19 infections.
One more case was added to the so-called Parafield cluster on Monday, taking the total to 27.
But the woman was already in quarantine after being identified as a close contact and likely to catch the virus.
Chief Public Health Officer Nicola Spurrier says she's quietly confident the current situation is under control, but this week will be key.
"If we have had more community transmission we will be starting to see it this week," she said.
Prof Spurrier said it was normal to wait for 28 days, or two incubation cycles, before declaring an outbreak "all over red rover".
But the Parafield cluster had been identified very early and officials were quickly aware of the chains of transmission.
The easing of concerns has also left SA on course to open its borders to Victorians from December and positive about the chances of returning to a lower level of local restrictions.
Police Commissioner Grant Stevens said he was hopeful Christmas "will be celebrated as we would hope to celebrate it".
"I've given a pretty clear indication that we're aiming at the first of December to go back to a level where most community activities and family gatherings could occur," he said.
© AAP 2020
Photo: South Australian Chief Public Health Officer Dr Nicola Spurrier. (AAP Image/David Mariuz)