Another case of COVID-19 has been identified in South Australia overnight.
- The fourth case is linked to the other cases confirmed yesterday
- There are long lines at COVID testing sites
- Businesses want more clarity about which of them are classified as essential
It brings the number of cases in the state's outbreak to four.
Authorities say the new case is a close contact of an 81-year-old man who tested positive after being taken to the Modbury Hospital in Adelaide's north-eastern suburbs on Sunday night.
The other two confirmed cases are the 81-year-old man's daughter and another close contact.
Deputy Chief Public Health Officer Emily Kirkpatrick said the new case was already "on radar" for SA Health and was in quarantine when he came back positive.
"Very pleasing we could get that result back and he was already in quarantine," Dr Kirkpatrick said.