While the A$6 billion cost is certainly staggering, Legge says the cost is probably higher, as the study was only based on the known effects of toxoplasma. It has also been linked to bipolar disorder and other mental health conditions, while new research has also linked it to brain cancer.
"I think the consequences on your mental health is probably the thing that I find scariest about this parasite," Legge says.
"Although it's a difficult parasite to treat, there are definitely things we can do to limit transmission and reduce the risk of infection and that's probably the place to start."
She recommends wearing gloves and washing your hands after working in the garden, cooking meat properly and restricting the movements of cats.
"So don't let cats into children's sandpits, it's a terrible hotspot for toxoplasma eggs, and don't let cats into your garden. Don't have feral cats around farms, because if feral cats aren't pooing in the paddocks where livestock are, livestock are less likely to pick up the parasite."
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