The state government is defending the decision to call the lockdown despite low case numbers and revelations a pizza shop worker allegedly gave false information to contact tracers about his whereabouts.

Chief Public Health Officer Nicola Spurrier presented modelling at a Sunday press conference that showed the state had a 99 per cent chance of a “significant” COVID-19 wave if it did not enter a lockdown last week.

She said she had “no regrets” about the decision and would only feel fully confident SA had escaped a second wave in a few weeks.

The state recorded just one new coronavirus case on Sunday, an overseas traveller in her 20s who was in a quarantine hotel. The Parafield cluster in suburban Adelaide remained stable at 26 cases.

The revocation of the stay-at-home order means bars and restaurants are back open, though bookings are capped at 10. Hairdressers, gyms and schools are back too.

But South Australians are being warned to be vigilant and urged to wear masks.

Premier Steven Marshall promised that police would provide an update on Monday on their investigation into the pizza shop.

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Police spoke with the worker, believe to be a 36-year-old temporary graduate visa holder, on Sunday, and seized electronic devices from him.

Despite the lockdown lifting, more than 4000 contacts of the outbreak remain in quarantine.

Nearly 17,000 tests were carried out on Saturday.

AAP