Surprised this article, and the researchers interviewed, don't highlight contagious agents as a possibility. There's a strong case that Toxoplasma gondii, a co

Surprised this article, and the researchers interviewed, don't highlight contagious agents as a possibility. There's a strong case that Toxoplasma gondii, a communicable parasite, can contribute to schizophrenia or other mental illnesses: http://www.cbsnews.com/news/cat-parasite-toxoplasma-gondii-linked-to-mental-illness-schizophrenia/ http://www.cbsnews.com/news/cat-parasite-toxoplasma-gondii-l... Other viruses have been posited as contributors to mental illness, and there's a relationship between schizophrenia and season-of-birth that may indicate prenatal/youthful infection with some otherwise mild seasonal illness (like flu) might increase the risk of schizophrenia later.