The study aimed to diagnose the infection of infectious bronchitis in broiler chicken farms  in Salah Al-Din governorate. Using the Infectious Bronchitis Virus (IBV) Rapid antigenic test and Polymerase Chain Reaction, The study included eight neighbouring regions for the city of Tikrit: (Al-Dabbssa, Al-Naaeimah, Al-Khazifei, Al-Alam, Sammrah, Al-Khzammeah Al-kharja and Al-Hammrah) during the period from October 2022 to February 2023. The results of our study showed diagnosis cases of infection with the disease in all regions and the infection rate was higher in regions Al- Naaeimah, Al-Khazifei and Al-Khzammeah. In addition, the infection rate was higher in October compared to other months. The results also showed the Infectious Bronchitis Virus (IBV) Rapid antigenic test gave real diagnostic results for infection with the disease. The study concluded that infection with the disease is present in all regions included in the study, and the infection rate was higher in three regions compared to the other regions. It was also shown that the weather has a role in the spread of infection during a certain time. In addition, the results showed that the IBV Rapid antigenic test can be relied upon in diagnosing cases of infection. disease because it gives real diagnostic results.