Molecular Identification of Fowl Adenovirus Associated with Inclusion Body Hepatitis in Iran

Background and Aims: Inclusion body hepatitis (IBH) is one of the most important reemerging diseases in many countries with intensive poultry industries. In Iran, the etiological agent of IBH (fowl adenovirus) has not been yet confirmed. The aim of this study was the molecular detection and identification of fowl adenovirus involving IBH in chicken flocks in Iran. Materials and Methods: Polymerase chain reaction (PCR) and sequence analysis of L1 hexon gene was utilized to detect and to determinate the genotypes of Fowl adenovirus (FAdV) in broiler breeder flocks. Histopathological sections were prepared and examined. Results: FAdVs were detected in livers. Based on sequencing analysis of the hexon gene, they were genetically related to FAdV-11, a member of the fowl adenovirus D species, with 98% homology to Korean strain in 2011. Histological examination revealed necrotizing hepatitis with basophilic intranuclear inclusion bodies in the hepatocytes. Conclusion: This study provided evidence for the role of fowl adenoviruses as agents, causing this clinical disease in Iran and indicated the importance of accurate diagnosis and prevention in the meat-type flocks.