revision preference src: Reviews of serological studies have estimated that 30 -- 50 % of the global population has been exposed to and may be chronically infected with latent toxoplasmosis, although infection rates differ significantly from country to country. <SEP> tgt: Reviews of serological studies have estimated that 30 -- 50 % of the global population has been exposed to and may be chronically infected with latent toxoplasmosis. Infection rates differ significantly from country to country.