South Australia has recorded just two new positive cases of coronavirus for a second consecutive day, as the State Government moves to boost bed capacity at one of Adelaide's major hospitals.

Key points: SA Health says 10 people are currently in ICU in the state

SA Health says 10 people are currently in ICU in the state The total number of confirmed cases in SA now sits at 411

The total number of confirmed cases in SA now sits at 411 It comes as the Opposition has called for flu vaccines for all frontline workers

SA Health today said the two new cases had taken the state's total number to 411.

Chief public health officer Nicola Spurrier said today's new cases were people aged in their 20s and in their 60s.

She said there were 20 people being treated in hospital in South Australia, with one additional person in ICU, taking the total to 10.

Dr Spurrier said seven people were in a critical condition and three were stable, with eight men and two women currently in ICU.

Fifty-three people have so far recovered in SA, however, that number was expected to rise with SA Health yet to collate GP data.

No further cases have been linked to the Ruby Princess, with the total number of cases linked to cruise ships remaining at 120.

SA Health remains concerned with a cluster of positive cases from the Adelaide Airport.

SA Health remains concerned about a cluster of cases at the Adelaide Airport. ( ABC News: Dean Faulkner )

Dr Spurrier said the cluster remained at 28 cases, including 17 baggage handlers and 11 secondary contacts.

She said 70 per cent of cases in South Australia had been acquired from overseas travel.

"Three cases in all of the people in SA have been local transmission, but others remain under investigation," she said.

"We can't be complacent, we need to keep going with this at this point of time," she said.

She said currently there were 535 people in quarantine because they have been in close contact with confirmed cases.

SA Pathology has so far undertaken about 33,000 tests.

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More beds at Women's and Children's Hospital

Earlier South Australian Premier Steven Marshall announced three new paediatric high-dependency beds at the Women's and Children's Hospital, along with 10 new intensive care beds that could be used for adults or children at the hospital.

The Women's and Children's Hospital in North Adelaide. ( ABC News: Angelique Donnellan )

About 80 nurses at the hospital will be "upskilled" to work in intensive care.

"I hope we never, ever use this additional bed capacity, nor these nurses, but the reality is we have to be prepared," Mr Marshall said.

Women's and Children's Health Network chief executive Lindsey Gough said this would double the hospital's capacity.

She said all hospitals were working together.

"We don't normally take adults but we are planning for the worst and the worst-case scenario might be that the adult intensive-care units run out of capacity, so we are making sure that the state is prepared and we can provide that adult capacity if needed," she said.

Opposition calls for free flu vaccines

The state Opposition wants all frontline healthcare workers vaccinated against the flu as a matter of urgency.

Labor is also calling on the State Government to give every South Australian a free flu vaccine to help ease the burden on hospitals, which are dealing with the coronavirus pandemic.

Opposition health spokesman Chris Picton could not say how much the plan would cost, but said it was worth any price tag.

"Compared with what the cost would be of extra resources used by our healthcare system if we get a big flu caseload this winter and dealing with COVID cases at the same time, well that's a very small price to pay," he said.

Health Minister Stephen Wade said it was not possible to provide a free flu vaccination for all South Australians.

He said there was a limit to the state's resources.

"It would not be possible to obtain the supplies to give every South Australian a free flu shot — to have done that we would've had to place orders at the end of last year," he said.

Mr Marshall said there were "plenty of flu vaccines" available despite some people having trouble getting appointments for the injection at pharmacies.

"The pattern of people going to get the flu vaccine has completely changed," he said.