A parasite responsible for toxoplasmosis — Toxoplasma gondii — may be involved in the cause of around a fifth of schizophrenia cases in the US. This is according to a new study published in the journal Preventive Veterinary Medicine. University of Pennsylvania researcher Greg Smith calculated that around a fifth of schizophrenia cases may be attributable to T. gondii.

More recently, studies have linked T. gondii infection to schizophrenia, and some have found that antipsychotic medication may even stop the parasite from replicating. But such research has been met with much criticism. 

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