Summary

• A protozoan parasite spread through food or water contaminated with oocysts, through infected meat or though contact with oocysts from feline faeces.
• Acute infection is usually asymptomatic, and once acquired, parasites remain in human tissues life-long.
• Symptomatic disease can be seen in immunocompromised patients with re-activation of latent infection or with acquisition of new infection.
• Symptomatic eye disease can be seen in both immunocompromised and immunocompetent patients.
• Primary infection during pregnancy is often asymptomatic in the mother, but can result in congenital disease in the fetus.