The prevalence of Gallibacterium anatis in poultry production has increased over the last two decades. However, only a few studies have explored the pathogenicity of this bacterium in commercial layer chickens. This trial had studied the aspects of the pathogenicity of Gallibacterium anatis biovar haemolytica local Egyptian isolate (previously registered as strain B14 with a GenBank accession no. KJ026147 using a 500 bp of 16S ribosomal RNA gene and 16S-23S ribosomal RNA intergenic spacer, partial sequence) in an experimental infection trial in commercial White Shaver layer chickens aged 19 weeks. The hens were divided into three groups (40 birds each), where the hens in groups 1 and 2 were experimentally infected with a dose of 0.2 ml/bird containing 1.2 x 109 CFU/ml intranasally (I/N) and intravenously (I/V), respectively. In contrast, group 3 was kept as a non-infected control group. Both I/N and I/V infection resulted in a delayed egg-laying for 1 week and a significant (p≤ 0.05) drop of egg production by 7.81 and 10.28% compared to control G3 throughout seven weeks. Severe lesions in the form of hemorrhagic pneumonia, catarrhal tracheitis, ovarian follicles’ and oviductal regression and septicemia were evident on necropsy demonstrating the pathogenicity of G. anatis as a primary pathogen.

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