Toxoplasmosis is widespread in humans, although its prevalence varies widely from place to place.

In Norway, the United Kingdom and the United States, it is estimated that 9-40% of the population are infected, whereas in Central and South America and continental Europe, estimates of infection range from 50 to 80%.

While rarely associated with acute pathology, T. gondii has been correlated with impulsive behaviors and health outcomes such as increased risk of car accidents, road rage, mental illness, neuroticism, drug abuse and suicide.

The explanation behind these altered behaviors is as disturbing as it is fascinating: because the parasite reproduces sexually only within wild and domestic cats, any changes in host behavior that make them more likely to get eaten by a feline are hypothesized to benefit the parasite.

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