Toxoplasmosis is a widespread infection in the world, but its prevalence varies from one country to another according to food habits in that country and compliance with hygiene rules (including contact with soil, unfiltered water or raw meat, washing of hands and vegetables). The incidence is very high in poor countries and in developing countries.
The Center for Disease Control (CDC, Centers for Disease Control and Prevention) based in Atlanta, USA reports that 22.5% of the population over the age of 12 years is infected with TG, and the incidence is higher in hot and humid climates and low altitudes. It is estimated that, annually, the US are born between 500 and 5,000 children with congenital toxoplasmosis. Although the majority of children seem healthy at birth, sequelae of congenital disease may occur tardy. The prevalence of congenital toxoplasmosis is estimated at 1/3.030 of births with symptomatic cases 1/29.000 of births.

