Toxoplasmosis is a zoonotic disease caused by Toxoplasma gondii, there are two hosts , cats play an important role as definitive hosts , cattle, sheep ,goats and human may play as intermediate hosts. Humans be infected by eating tissue cysts from Not cooked flesh and eat contaminated feed or water with oocytes shed in the faecal of infected cats. diagnosis of T. gondii  itself is affirmation  the infection but difficult, so many  laboratories use serological methods  to detect immunoglobulins  which specific to  T. gondii : latex agglutination (LA) test, Enzyme Linked Immuno Sorbent Assay  and indirect fluorescent antibody test (IFAT) those methods was differ in  specificity and sensitivity there is no systematic review that can perform the state of toxoplasmosis in the definitive  host. Therefore the aims of the current existing review was to decided the risk factor of T. gondii infection and demonstrated  the epidemiological form of infection in cats in Iraq.