Toxoplasma gondii infects the brain, as do many other pathogens.However, Toxoplasma differs from other pathogens in that it

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Toxoplasma gondii is known to cause behavioral changes in its host, such as increased risk-taking and decreased aversion to predators in rodents. These behavioral changes are thought to increase the likelihood of the parasite being transmitted to its definitive host, usually a cat. Toxoplasma does not typically cause tumor formation or destruction of brain tissue, and it does not always kill the host.

Toxoplasma Gondii Infects the Brain, as Do Many Other Pathogens