South Australia reduces booster shot intervals to three months

South Australia is reducing its booster vaccine interval to three months.

It means that anyone over the age of 18 who had their second dose three months ago is now eligible for their booster shot in South Australia.

"The reason why we can go from originally six months to five months, four months to three months is that we were given the approval to do so when we reach, if you like, the threshold in terms of supply," Premier Steven Marshall said.

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"This will create increased demand of around 225,000 shots in South Australia.

"The supply and the availability of vaccinations in South Australia is currently at a record level."

NSW and Victoria both announced today they too were shortening the interval to three months for boosters.

It comes as South Australia recorded 3482 new COVID-19 cases and three deaths.

Mr Marshall said the new case numbers are below the state's seven-day average.

There are 294 people in hospitals, with 23 in ICU and four on ventilators.

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Mr Marshall said Chief Public Health Officer Professor Nicola Spurrier asked for another 24 hours to provide an accurate split of data on people being hospitalised because of COVID-19 rather than with it.

"We are admitting some people for observation into country hospitals, because we don't have a medihotel facility in a range of country settings. So that is artificially inflating the number in hospitals," he said.

SA Health to investigate 'harsh' hospital rules

South Australia's Opposition is calling on the Marshall government to scrap rules at the Lyell McEwin Hospital that restrict the time a father, partner or support person can be in hospital during and after the birth of a baby, despite testing negative to COVID-19.

Mr Marshall admitted the restrictions were "harsh" and said he had asked SA Health to review them.

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SA may be reaching its Omicron peak

Mr Marshall said there are indications South Australia is reaching its Omicron peak.

"ICU and ventilator numbers are stable and in fact reducing over the last week, so another indication that we are perhaps at or about that peak in South Australia," he said.

"We've been seeing over the last weekend a gradual reduction in the number of people working in SA Health who are COVID positive… another indication I think we're at or about that peak here in South Australia."