Alsultan, Musaed Abdulaziz2022-05-182022-05-182018713https://drepo.sdl.edu.sa/handle/20.500.14154/3984Infectious bronchitis virus (IBV) still to pose great economic losses among chickens of all ages in many parts in the world. Despite the massive application of IBV vaccines in many countries including Saudi Arabia, several outbreaks are still frequently reported. One of the important challenges that hampered the selection of the right vaccine candidates is the identification of the local circulating strain in a certain area. IBV is recently reported may chickens flocks in the Eastern region of tenThesis