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Abstract
Ciav is an economically important disease . The primary importance of cvai infection in commercially produced chicken is due to the immunosupperssion it causes in young chickens whether directly as it causes generalized lymphoid atrophy or indirectly by practipating other immunosuppressive viruses such as infections bursal disease virus (IBVD) marek,s disease virus (MDV) or reticulondotheliosis virus (REV).