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How worried should I be?

So should the fact that one in three people carry a brain-dwelling parasite keep us awake at night?

Probably not.

For most healthy people, toxo remains a silent passenger for life, causing no illness at all. Our health care system already manages the situations where it poses genuine risks, particularly during pregnancy and in people with weakened immune systems.

But understanding how this remarkably successful parasite hides from our immune system could lead to something we've never had before: treatments that completely clear dormant infection.

That would make a real difference for the people most at risk and would transform how we think about one of the world's most common infections.