Unusual protozoan infection Severe toxoplasmosis 2019-04-08T19:22:59Z Toxoplasmosis is a widespread parasitic infection that is frequently asymptomatic in immunocompetent patients. However, this obligate intracellular protozoan parasite can evade the immune system and persist for the life of its host in cyst form, predominantly in the brain, retina, and muscles. Reactivation of latent cysts may occur when the immune system fails to maintain cytokine pressure, which mainly relies on gamma interferon (IFN-gamma). Toxoplasmosis is a life-threatening infection in immunocompromised patients (ICPs).