South Australia has recorded zero new coronavirus cases for the fourth day in a row.

On Sunday, Acting Chief Medical Officer Dr Michael Cusack gave an update saying the 438 cases in the state remains the same.

A total of 94 per cent of people infected in the state have recovered.

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Two people remain critical in ICU and there were 1136 tests conducted on Saturday.

There have been 52,000 tests done in total in South Australia.