Characterizations of a clinical Gallibacterium anatis strain from poultry in the respiratory tract：a case report

Background: Gallibacterium anatis , is a gram-negative coccoba-cillus that belong to the family of Pasteurellaceae . It is the historically considered an opportunistic pathogen of intensively reared poultry and domestic birds. It is the main cause of salpingitis, ovaritis and peritonitis. G. anatis infection lead egg yield and egg quality of laying hens will be reduced after infection. G. anatis has seriously affected the overall productivity of the world poultry industry and caused economic losses in the poultry industry. Case presentation Herein, we reported that this pathogen can cause obvious respiratory diseases in hens and serious harm to the reproductive tract of laying hens. The clinical symptoms of sick chickens include tracheal hemorrhage, yellow inflammatory secretion, pulmonary hemorrhage, tubal edema, yolk rupture and yolk peritonitis. We isolated and cultured the pathogenic bacteria. The characteristics of pathogenic bacteria were investigated by hemolytic activity assay, biochemical assay, and drug sensitivity test. Conclusions: Based on the isolation, identification and characteristic detections of this isolations showed that the pathogen was gram-negative bacterium Gallibacterium anatis , which could ferment glucose, mannitol, inositol, and sorbitol. Catalase and oxidase test were positive. Cephalosporins and tetracyclines have good inhibitory effect on the pathogen, β- Lactam antibiotics will have strong resistance.