South Australia has recorded 1,472 new cases of COVID-19 but the number of people in hospital remains at 36.
SA Health says 37 people including six children are in hospital with COVID-19, with four patients in intensive care
One, a man in his 30s, is on a ventilator.
Only 57 per cent of those cases in hospital are fully vaccinated, a much lower proportion than the 87.5% of the general population aged 12 and over which is fully vaccinated.
6,279 people in South Australia are how in home or hotel quarantine, a significant increase on the 4,853 reported on Tuesday.
SA Pathology processed more than 22,000 tests on Tuesday, more than 1,700 of which were for people getting tested ahead of travel to Queensland.
Due to constraints on the testing system, Mr Marshall says South Australia will no longer provide pre-departure PCR tests for any states.
Mr Marshall also welcomed the Queensland government's decision to scrap its requirement for pre-arrival PCR tests.
On Boxing Day, South Australia scrapped the pre-arrival PCR testing requirement for interstate travellers, instead asking them to undertake a rapid antigen test.
New testing requirements were also introduced for close and casual contacts, with close contacts only required to get one initial PCR test and one other before completing their quarantine period.
Casual contacts only need to get tested if they develop symptoms.
Booster to become mandatory for health workers
The Premier also flagged it would soon be mandatory for frontline healthcare workers and those working with vulnerable people, such as in aged care and disability settings, to have a booster shot.
"I spoke to the Police Commissioner this morning, and he is preparing that direction. It will be a requirement for people to have that booster within two weeks of when they become eligible," Mr Marshall said.
He added a "major quest" for the state is to increase its double-vaccination rate to above 90 per cent, as well as to distribute booster shots in a timely manner.
"We’ve shortened the interval for booster shots from six months down to four months," he said.
"So, effective on the 4th of January, many hundreds of thousands of additional South Australians will become eligible for that vaccination."
In an effort to further free up the health system, the Premier also announced elective surgeries in South Australia would be limited to category 1 and urgent category 2.
National cabinet to consider 'standardisation' of COVID measures
The Premier flagged Thursday's national cabinet meeting as an opportunity for state premiers to discuss the possibility of a more uniform approach to travel requirements.
"There’s still some disparity, which is causing confusion.
"As we move through the various stages of this new Omicron variant, we do need to do more towards standardisation as much as possible."
Mr Marshall added the states would receive a "very significant update" with regards to availability of rapid antigen tests, and their use as Australia responds to the Omicron variant.
