Published online by Cambridge University Press: 15 January 2010
Toxoplasmosis is one of the commonest protozoal infections in man. The causative organism, Toxoplasma gondi has been estimated to have infected in the region of 25–50% of the world's population with evidence of serological infection ranging from 2 to 90% depending on the geographical area. The infection is usually harmless and subclinical, the primary infection being rarely diagnosed. However, it can lead to life threatening disease in the immunocompromised patient and a primary infection in pregnancy can have severe sequelae in the fetus.