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Updated: Jun 19, 2026

3-D Imaging and Analysis of Neurons Infected In Vivo with Toxoplasma gondii
06:33

3-D Imaging and Analysis of Neurons Infected In Vivo with Toxoplasma gondii

Published on: December 9, 2014

Toxoplasma and schizophrenia

R H Yolken1, F B Dickerson, E Fuller Torrey

  • 1Stanley Division of Developmental Neurovirology, Johns Hopkins University School of Medicine, Baltimore, MD 21287-4933, USA. Rhyolken@gmail.com

Parasite Immunology
|October 15, 2009
PubMed

Insights

Toxoplasma gondii infection is increasingly studied as a potential cause of schizophrenia. Research indicates links between Toxoplasma gondii antibodies, cat exposure, and schizophrenia symptoms.

Area of Science:

  • Neuroscience
  • Infectious Diseases
  • Psychiatry

Background:

  • Schizophrenia is a complex mental disorder with a poorly understood etiology.
  • Infectious agents are increasingly investigated as potential contributing factors to schizophrenia.
  • Toxoplasma gondii, an opportunistic parasite, has emerged as a significant candidate due to multiple lines of evidence.

Purpose of the Study:

  • To review and synthesize the evidence linking Toxoplasma gondii infection to schizophrenia.
  • To explore the biological, epidemiological, and pharmacological connections between Toxoplasma gondii and schizophrenia.
  • To identify outstanding questions regarding the role of Toxoplasma gondii in schizophrenia etiology.

Main Methods:

  • Review of existing epidemiological studies comparing schizophrenia patients and controls.
  • Examination of clinical observations of toxoplasmosis-induced psychosis.
  • Analysis of pharmacological data on antipsychotics and antiparasitic activity.
  • Investigation of animal models showing Toxoplasma gondii-induced dopamine level alterations.

Main Results:

  • Higher prevalence of T. gondii antibodies in individuals with schizophrenia compared to controls.
  • Similarities in epidemiological patterns between toxoplasmosis and schizophrenia.
  • Antipsychotic medications show inhibitory effects on T. gondii.
  • T. gondii infection in animals leads to elevated dopamine levels, a hallmark of schizophrenia.

Conclusions:

  • Toxoplasma gondii presents a compelling candidate for involvement in schizophrenia etiology.
  • Further research is needed to clarify the roles of parasite strain, infection timing, and host genetics.
  • Establishing a definitive link could revolutionize schizophrenia treatment and prevention strategies.

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