Wastewater testing in Adelaide has returned a second strong positive result for coronavirus, raising concerns among health officials and prompting calls for more people to get tested.
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A similar result was recorded on Sunday with both related to catchment areas covering Adelaide's CBD.
It's possible the results have come from old cases of the virus among people in the city's quarantine hotels.
But authorities have urged anyone who visited the CBD in the past week to get swabbed if they have even the mildest of symptoms.
"It's really important that we do remain alert in the community," Deputy Chief Public Health Officer Emily Kirkpatrick said on Tuesday.
"While we're not saying that there's any indication that there is community transmission here in South Australia, it is really important that if you are out and about that you do get tested if you have even the slightest of symptoms."
Dr Kirkpatrick said SA was also checking with other states on the movement of people across the border in recent weeks to see if they correlated with anyone who had recently recovered from having the virus.
SA reported two new cases of COVID-19 on Tuesday, one in a teenage girl and one in a man in his 60s, who recently returned from overseas.
They are both in hotel quarantine.
The state also began distributing the Pfizer vaccine from the Lyell McEwin Hospital, in Adelaide's north.
Frontline staff, including Dr Dharminy Thurairatnam, who was the first to identify the Parafield cluster of cases in November, will be the first in line with about 350 people expected to get the jab over the next week.
SA has administered almost 4000 vaccinations since the program began two weeks ago.
That still leaves it well short of the 12,000 forecast over the first three weeks.
Australian Associated Press
