Molecular Detection of fowl adenovirus 7 from slaughtered broiler chickens in Iran: The first report

Document Type : Short paper


Department of Clinical Sciences, Faculty of Veterinary Medicine, Karaj Branch, Islamic Azad University, Alborz, Iran



Background: Fowl adenoviruses (FAdVs) are responsible for a variety of clinical symptoms with an increasing significance in the poultry industry throughout the world. Typical diseases caused by fowl adenoviruses include inclusion body hepatitis(IBH), hepatitis-hydropericardium syndrome (HHS), gizzard erosion (GE), respiratory disease, and hemorrhage in muscles and organs. Aims: During 2020, Broiler chickens from north of Iran showed ecchymotic and petechial hemorrhages in thigh and breast muscles at slaughterhouse. Hemorrhages were observed in 10% to 60% (with an average of 20-30%) of chicks per each flock. To find out the etiology of these lesions, the present study was conducted. Methods: Different environmental factors were investigated and FAdV, infectious bursal disease virus(IBDV), and chicken infectious anemia virus (CIAV) were detected using molecular assays.  Results: Among the viruses tested, FAdV was detected by PCR, and sequence analysis clustered the virus into species E, serotype 7.  Conclusion: This is the first report on FAdV-7 existence among poultry in Iran. Effective screening of the chicks at slaughtering age should be performed from the whole country.


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