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  • Title: First report of fowl adenovirus 8a from commercial broiler chickens in Egypt: molecular characterization and pathogenicity.
    Author: Radwan MM, El-Deeb AH, Mousa MR, El-Sanousi AA, Shalaby MA.
    Journal: Poult Sci; 2019 Jan 01; 98(1):97-104. PubMed ID: 30690614.
    Abstract:
    This study was performed to isolate fowl adenovirus (FAdV) circulating in commercial meat-type chicken in Egypt during 2015 and to identify the pathogenicity of the isolated virus. Cloacal swabs were collected from 9 commercial broiler farms from chickens of 3-5 wk of age in Behira province in Egypt during 2015. FAdV was isolated on chicken embryo liver cells. The virus was identified by conventional polymerase chain reaction targeting a conserved region in the hexon gene. Moreover, phylogenetic analysis of the L1 loop of the hexon gene revealed that the isolated viruses clustered with reference strains belonging to FAdV serotype 8a. This is the first record of FAdV from Egypt on the GenBank. The isolated virus is closely related to strains directly associated with inclusion body hepatitis (IBH) causing considerable economic losses. Pathogenicity study of the virus did not show any mortality, although necropsy and histopathological examination displayed severe hepatitis and degenerative changes in the immune system after 5 d from infection, proving that the virus can cause IBH with intermittent shedding.
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