"Crazy cat lady" stereotypes or not, there could be some actual psychological risks from hanging around so many kitties… if just one of them is harboring the parasite Toxoplasma gondii.

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Sources:
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Effects of Toxoplasma gondii Infection on the brain https://www.ncbi.nlm.nih.gov/pmc/arti...

Describing the Relationship between Cat Bites and Human Depression Using Data from an Electronic Health Record http://journals.plos.org/plosone/arti...

Toxoplasma gondii Infection and Selfdirected Violence in Mothers http://jamanetwork.com/journals/jamap...

The Neurotropic Parasite Toxoplasma Gondii Increases Dopamine Metabolism http://journals.plos.org/plosone/arti...

GLT1Dependent Disruption of CNS Glutamate Homeostasis and Neuronal Function by the Protozoan Parasite Toxoplasma gondii http://journals.plos.org/plospathogen...

GABAergic Signaling Is Linked to a Hypermigratory Phenotype in Dendritic Cells Infected by Toxoplasma gondii http://journals.plos.org/plospathogen...

Is Toxoplasma Gondii Infection Related to Brain and Behavior Impairments in Humans? Evidence from a PopulationRepresentative Birth Cohort http://journals.plos.org/plosone/arti...