South Australia has reached a landmark seven days without recording a new case of coronavirus, as health authorities look to start easing travel restrictions within the state.

Key points: Thursday marks the end of the state's "testing blitz"

Thursday marks the end of the state's "testing blitz" A meeting will be held with regional leaders to discuss easing restrictions

A meeting will be held with regional leaders to discuss easing restrictions The Barossa Valley reopened on Wednesday

The result comes as a two-week testing blitz — that has seen more than 15,000 tests done in the state — winds up tomorrow.

SA Health said 96 per cent of those who had suffered from the virus had now recovered, with just 14 cases still considered "active".

Four people remain in hospital, with one person in the ICU in a critical condition.

Chief Public Health Officer Nicola Spurrier declared the week a "milestone" for South Australia.

"This is a landmark for us, we have gone a whole week now without any cases of COVID-19 in South Australia," Dr Spurrier said on Wednesday.

"That puts us in a very, very strong position, particularly with the high rates of testing.

"A big thank you to all South Australians who have come forward … and been tested."

Hospital staff test people in the Barossa Valley. ( AAP: David Mariuz )

Dr Spurrier said a meeting would be held with regional leaders to discuss lifting travel restrictions in the state's regions," she said.

"It is important that we engage with the mayors and the communities in those parts of South Australia because of the sensitivities of keeping all of our communities safe.

"People in my team are reaching out to put a meeting in place so that we can get that information."

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Travel restrictions eased for Barossa Valley

The Barossa Valley was reopened on Wednesday after the area was shut off to visitors because of two separate virus clusters.

Mayor Michael Lange said it was good news for the region.

"We can sort of get back to trying to look forward to the future and start working on our recovery plan, assisting where we possibly can with our businesses, our residents and our wider community," he said.

Schools in the Barossa Valley had been closed due to concerns over a cluster of positive cases. ( ABC News: Brittany Evins )

The principal of a Barossa Valley primary school also said students were overjoyed to be back at school today.

Schools in the region have been closed for more than a month due to the clusters of positive COVID-19 cases, which have both been linked to tour groups.

St Jakobi Lutheran School Principal Julian Helbig said students had been running around the school today with big smiles on their faces.

"Real kick in the step, it's been lonely here, working away and walking around the yard during the day," he said.

"Even our resident magpies were like 'where is everyone', it's just great to see everyone back."

Dr Spurrier said the Barossa Valley would not be exempt from the talks that would be conducted with other regions.