An estimated 40% of cats and 11% of people in the US carry Toxoplasma gondii parasites, which evidence suggests could influence brain function and cause inflammation, though most people are not exposed directly through contact with cats. Although no causal evidence has been found, some studies have linked toxoplasmosis to an elevated risk for schizophrenia, and experts say the findings underscore the importance of good hygiene and suggest scientists should pursue a feline toxoplasmosis vaccine as well as more effective treatments.
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