Magdy El Sayed

1. IntroductionInfectious bronchitis virus (IBV) is a single-stranded enveloped RNA virus that belongs to the genus Gammacoronavirus, family Coronaviridae [1]. The virus causes a clinical disease characterized by coughing, sneezing, tracheal rales, and watery eyes. In layer and breeder chickens, the disease is associated with both quantity and quality deterioration of egg production. Lesions in in ...