Toxoplasma gondii IgG serointensity and cognitive function in bipolar disorder

Area of Science:

• Neuroscience
• Infectious Disease

Background:

• Cognitive dysfunction is a key symptom of bipolar disorder.
• Toxoplasma gondii (T. gondii) infection is associated with bipolar disorder and cognitive impairment.

Purpose of the Study:

• To investigate the association between T. gondii seropositivity, serointensity, and cognitive function in euthymic bipolar disorder patients.

Main Methods:

• 76 bipolar disorder patients were tested for T. gondii IgG/IgM antibodies.
• Cognitive performance was assessed using a neuropsychological test battery across three domains.
• Statistical analyses included ANCOVA for seropositivity and partial correlations for IgG serointensity, controlling for age and IQ.

Main Results:

• In T. gondii IgG seropositive individuals (n=27), higher antibody levels correlated with poorer verbal memory.
• No significant differences in cognitive domains were found between IgG seropositive and seronegative participants.
• Insufficient IgM positives (n=7) precluded analysis.

Conclusions:

• This study is the first to demonstrate a link between T. gondii IgG serointensity and memory function in bipolar disorder.
• Findings support existing literature on T. gondii infection and cognition in bipolar disorder.
• Further research is needed to confirm findings and establish causality.