A first case of hepatitis A linked with recalled frozen berries imported from China has been reported by South Australian health authorities.

The woman, 54, is from country SA.

SA Health chief medical officer Paddy Phillips said she had been admitted to the Royal Adelaide Hospital and was in a stable condition.

"This is the first case of hepatitis A in South Australia that can be linked to the recalled frozen berry products," Professor Phillips said.

"The patient saw her doctor on the 15th of February when she began displaying symptoms and a positive blood test for hepatitis A was returned on the 24th of February."

Professor Phillips said the woman probably ate the berries over the Christmas period.

"SA Health began the process of investigating how the illness was contracted and the patient confirmed she ate Nanna's frozen mixed berries over the Christmas and new year period," he said.

"There is no risk of infection to the wider community, but as a precaution we've arranged for four of the patient's close contacts to receive a preventative vaccination."

SA Health's hepatitis A advice Hepatitis A is a viral infection of the liver and spreads when people eat or drink food or water contaminated by faecal matter containing the virus

Hepatitis A is a viral infection of the liver and spreads when people eat or drink food or water contaminated by faecal matter containing the virus Risk is very low

Risk is very low Symptoms to watch for are fever, abdominal pain, feeling generally unwell, dark tea-coloured urine, yellowing of skin or eyes

Symptoms to watch for are fever, abdominal pain, feeling generally unwell, dark tea-coloured urine, yellowing of skin or eyes Seek medical attention immediately if there are symptoms - Professor Paddy Phillips

Health authorities said there had been 21 cases of hepatitis A nationally associated with the current outbreak: three in Victoria, eight in Queensland, seven in New South Wales and one each in Western Australia, SA and the ACT.

SA Health said anyone who had eaten frozen berry products recently needed to be aware of the symptoms of hepatitis A and contact their doctor if they had concerns.

"Symptoms of hepatitis A include abdominal pain, nausea, fever and chills and yellow skin or eyes," Professor Phillips said.

He said there had been four cases of hepatitis A in South Australia for the year, but this was the first associated with frozen berries.

SA Health said there was no specific treatment for hepatitis A but there were options of using painkillers and boosting fluids, sometimes requiring hospital admission.