A total of 100 broiler farms reprsenting 765 500 chickens from 5 different Egyptian governorates at Delta, including ; Al-Dakahlia (56), Dametta (20), Al-Sharkia (6), Kafer Elsheakh (8), Al-Gharbia (10) farms respectively; were examined with both clinical and seroexamination. Sample for rapid test contains pool from 5 tracheal swabs were collected randomly from birds showed clinical symptoms of AI, samples for PCR contains pool from 5 tracheal  and 5 colacal swabs. Samples were collected during period from 2/1/2010 to 28/12/2010.  Results of rapid test showed 39.2%, 50%, 60% , 75% , 40%  also , results of RT PCR test showed 33.9% , 30% , 33.3% , 50% and 30% for governorates of Al-Dakahlia, Dametta, Al-Sharkia, Kafer Elsheakh and Al-Gharbia, respectively.