Human Epidemiology
The prevalence of human infection by Toxoplasma varies greatly between countries. Factors that influence infection rates include diet (prevalence is possibly higher where there is a preference for less-cooked meat) and proximity to cats.
The rates of positive sero-prevalence in women at child-bearing age between 1990 and 2000 were 58% in Central European countries, 51–72% in several Latin-American countries and 54–77% in West African countries. Low seroprevalence, 4–39%, was reported in southwest Asia, China and Korea as well as in cold climate areas such as Scandinavian countries (11–28%). Although T. gondii infection is thought to be detrimental it may have positive effects on some individuals, contrary to the mainstream view. For example T. gondii seems to stop brain deterioration to Alzheimer's disease. T. gondii has also been linked to pre-natal depression, as well as increased anxiety and depression during pregnancies. It has also been linked with mood disturbances in nonpregnant populations, including schizophrenia and suicidal behavior.
Read more about this topic: Toxoplasma Gondii
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“The most threatened group in human societies as in animal societies is the unmated male: the unmated male is more likely to wind up in prison or in an asylum or dead than his mated counterpart. He is less likely to be promoted at work and he is considered a poor credit risk.”
—Germaine Greer (b. 1939)