Defining the spreading of the avian adenovirus strains in different types of fowl profile production, recognising their property and determining their types and molecular characterisation are very important from the epidemiological point of view and are considered as excellent basis for vaccine development and gene therapy implementation. Mainly, type FAdV-4 is responsible for hydropericardium hepatitis syndrome (HP), type FAdV-1 for gizzard erosion and ulceration (GEU), and types FAdV-2, 8a, 8b, and 11 seem to be responsible for inclusion body hepatitis (IBH). A globally emerging trend of adenoviruses and adenovirus-associated diseases has been increasing from year to year in all over the world. Ubiquity of adenovirus strains was commonly described, and stand-alone pathogenicity for a long time has been disputed. They can cause latent infection or several diseases and are the reason of economic losses in poultry flock industry.
Pathogenic role of the viruses is not always clear. An investigation into the aetiology of fowl adenovirus strains and their distribution worldwide in populations of poultry flocks industry has been conducted.
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