Although cats are the definitive host, Toxoplasma gondii (T. gondii) infects about a third of humans, spreading through feline faeces, contaminated water and undercooked meat. T. gondii increases risk-taking in rodents, which helps spread the parasite to cats. Human studies link toxoplasmosis with several psychiatric conditions, including schizophrenia, bipolar disorder, personality disorders, suicidal behaviour and, in a new study, intermittent explosive disorde
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