Iraqi Journal of Veterinary Sciences

Abstract

The aim of this study was to know the etiological agent of mortality which occurred in broilers and parent stocks farms in Ninava province. The main noticed symptoms was swollen head. The suspected samples were inoculated in to embryonated egg to isolate the suspected virus. Neutralization test was performed using hyperimmune serum of pneumo virus and sera from infected birds. Experimental infection via nostrils was performed, samples from bronchi and lungs were taken for histopathological examination. Results showed that gross lesions were observed after second passage of isolates, two which showed mortality after first passage. Hyperimmune serum and sera from infected birds neutralized the isolates, there was variation among isolates. Histopathological picture showed congestion of bronchiole , hemorrhage between alveoli with clot in most of blood vessels with in the lung.