Associations between Toxoplasma gondii seropositivity and psychopathological manifestations in schizophrenic patients: A single-center study from Ecuador

PLoS One. 2024 Feb 23;19(2):e0297523. doi: 10.1371/journal.pone.0297523. eCollection 2024.

Abstract

Background: Schizophrenia, a complex neuropsychiatric disorder, is believed to be influenced by various factors including environmental exposures. A potential environmental factor is the infection by the obligate intracellular parasitic protozoan, Toxoplasma gondii which affects neurotransmitter levels, which could potentially exacerbate, trigger symptoms of schizophrenia or make them worst.

Objective: To investigate the association between Toxoplasma gondii seropositivity and psychopathological presentation in persons with schizophrenia in Ecuador.

Methods: This study was conducted at the Neuroscience Institute of Guayaquil, Ecuador. Among 368 inpatients, 104 were selected based on specific inclusion and exclusion criteria. Descriptive statistics captured patient characteristics and mental health outcomes. Logistic regression models estimated the effect of toxoplasmosis on various mental health outcomes, controlling for demographic and health-related variables.

Results: 86.5% of participants were seropositive for toxoplasmosis. Toxoplasma-seropositive schizophrenic patients had a lower risk of depression but a significantly higher risk of disorientation. The most prevalent mental health outcomes were Language Impairments (70.2%) and Bizarre Behavior (76.0%).

Conclusion: Our findings suggest that Toxoplasma gondii seropositivity may have specific effects on mental functions in schizophrenic patients, particularly reducing the risk of depression but increasing the risk of disorientation. Further studies are required to clarify these associations and the potential underlying mechanisms.

MeSH terms

  • Antibodies, Protozoan
  • Confusion
  • Ecuador / epidemiology
  • Humans
  • Risk Factors
  • Schizophrenia* / complications
  • Schizophrenia* / epidemiology
  • Schizophrenia* / parasitology
  • Seroepidemiologic Studies
  • Toxoplasma*
  • Toxoplasmosis* / complications
  • Toxoplasmosis* / epidemiology

Substances

  • Antibodies, Protozoan

Grants and funding

Funded was provided entirely by the Research department from the University Universidad de Especialidades Espiritu Santo (https://uees.edu.ec/investigacion/) to D.R. with the following funding code MEDI04022016. The funders did not play any role in the study design, data collection, analysis, decision to publish nor preparation of the manuscript.