A microscopic parasite quietly infects the brains of millions worldwide. Known scientifically as Toxoplasma gondii, this tiny invader silently alters brain function without obvious symptoms. Beneath ...

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A brain-infecting parasite carried by rats and slugs — and capable of causing neurological illness in humans — has surfaced closer to home, prompting questions about whether it could spread north into ...

A common parasite long thought to lie dormant is actually much more active and complex. Researchers found that Toxoplasma gondii cysts contain multiple parasite subtypes, not just one sleeping form.