As schools and childcare centres around the country contact parents about frozen berries served to students, concern over the contaminated berries reach is escalating.
The government is now under pressure to act on food labelling.
South Australia’s Chief Educator, Jayne Johnston, said it was unclear how many students could be at risk or how they may have consumed the berries.
"I don't know exactly which sites they are and therefore how big they are," she said.
"I also don't know how the berries were used. It may have just been with one class, it may have been put into some muffins sold at the canteen, so it's very hard to get a judgement."
There are now 13 cases confirmed nationally: three in Victoria, four in New South Wales, five in Queensland and the latest case in WA.
The nation's Chief Medical Officer, Professor Chris Baggoley, said tests were being conducted to ascertain the link between those infected.
"As we understand it they've all consumed the berries in question and so there is certainly what they call an epidemiological link," he said.
Professor Baggoley said while there may be more cases in coming weeks, the virus wasn't likely to spread too far.
"Very conservatively, it is up to one in 100 who consume these berries will get a Hepatitis A infection," he said.
Food-standard laws were now being reviewed in the wake of this scare.
"As we understand it they've all consumed the berries in question and so there is certainly what they call an epidemiological link."
Berries were considered a low-risk surveillance food, so therefore were not screened or tested for contaminants like Hepatitis A before coming into Australia.
Health Minister Sussan Ley today said the fact that Hepatitis A had been contracted by people eating a contaminated food product was "appalling."
The government was under pressure to enforce tougher labelling on products so consumers could identify Australian-grown produce.
"Australian farmers and processors have to meet those health and safety standards," Greens Leader Christine Milne said. "But the overseas producer doesn't."
Agriculture Minister Barnaby Joyce said it was his intention to increase scrutiny on labelling.
"I want to make sure that people can clearly identify when I go to the shop an Australian, a genuine Australian product because we do have stronger sanitary laws," he said.
Four Patties products have now been recalled: One-kilogram Nanna's Frozen berries and frozen raspberries, and 300 and 500 grams Creative Gourmet mixed berries.
The fruits were sourced from China.
Concern has also reached an NRL club in Sydney after three West Tigers players ate the recalled berries as part of nutrition program.
"They've been tested for it, we'll get the results soon and then life will go on," coach Jason Taylor said.
The Red Cross had received hundreds of calls from blood donors concerned about the blood they've supplied.
It recommend contacting them before donating blood if people had consumed the recalled products in the past few months.
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