Health authorities in Victoria and South Australia have linked semi-dried tomato product mixed with garlic, herbs and oil to a spike in hepatitis A cases.

South Australia director of public health Kevin Buckett said that there have been 26 cases of Hepatitis A in the state since March. There have been more than 70 in Victoria and the number of such cases has also increased in Queensland.

The suspected tomato product is manufactured in both Victoria and Queensland and sold in various states by weight. It is sold in supermarkets and is also used by snack bars and cafes in food preparation.

As precautionary measure, people are being warned against eating loose semi-dried tomatoes sold in oil with herbs and garlic at IGA, Foodland, Foodworks and independent delis and cafes.

"Although the links between the product and a recent increase in hepatitis A cases in Victoria are still under investigation, we have taken this measure in collaboration with our colleagues in SA," said Victoria's acting Chief Health Officer, Rosemary Lester in a statement.

Symptoms of hepatitis A include abdominal pain, nausea, fever and chills and jaundice. The department has urged the people experiencing these symptoms to contact their doctor or "Nurse On Call" on 1300 6060 24.