Abstract
Inclusion body hepatitis (IBH) is one of the major global disease problems, causing significant economic losses to poultry industry of the United States and Canada. The disease is characterized by its sudden onset and high mortalities. Amongst different serotypes of fowl adenoviruses (FAdVs) associated with IBH, serotype 8 of group I FAdV has been isolated from majority of IBH cases. In present studies, we isolated a FAdV from morbid liver of a 17-day-old broiler from a Saskatchewan broiler farm. This newly isolated virus was designated as IBHV(SK). However, based on the sequence analysis of the L1 region of the hexon gene, the IBHV(SK) may be classified as FAdV 8b strain 764. These studies describe for the first time the complete hexon gene sequence of FAdV serotype 8b. Experimental infection of 2-day-old (n = 48) and 2-wk-old (n = 56) chicks caused 83% and 43% mortalities, respectively. Determination of the complete hexon gene sequence of IBHV(SK) with establishment of a disease model in chickens will facilitate the development of type-specific diagnostic reagents and assays for the evaluation of potential experimental vaccines against pathogenic FAdV infections.
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