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Toxoplasmosis, caused by Toxoplasma gondii, is a disease that manipulates the brains of its hosts, including humans. Around one-third of the world's population is infected, often without knowing it. Symptoms, when present, are mild and flu-like. Toxoplasma increases dopamine, a neurotransmitter involved in seeking novelty, potentially altering behavior. Humans can contract the parasite by ingesting oocysts from contaminated water, unwashed produce, sandboxes, or litter boxes. Toxoplasma has been linked to schizophrenia, bipolar disorder, obsessive-compulsive disorder, aggression, slowed reactions, and decreased concentration. It remains unclear whether the parasite manipulates our brains to attract predatory cats or if our brains simply share similarities with rodents. Toxoplasma is a highly successful parasite.