Pathological Studies on some bacterial respiratory affections in broiler flocks

The present work was performed to study some bacterial respiratory affections in broiler flocks. This study included isolation onto blood agar, blood agar with gentamycin and MacConkey’s agar and identification according to the laboratory manual for isolaidentification of avian pathogen. The pathological part was designed toreport the pathological changes and correlate between it and the causativeagent. The samples were selected from thirty two farms fromdifferent localities at Sharkia and AdDakahlia province sufferingrespiratory signs through 4 seasons and include several ages and allbreeds. Only 53 cases selected from freshly dead or slaughtered andcollected for both microbiological and pathological examination.The bacteriological result was among 53 cases 49 cases there werebacterial growth. Thirty two (60.4) cases were single growth. Escherichiacoli 22 (41.5 %), Pseudomonas 4(7.5%), Staphylococcus 2(3.8%),Proteus one case (1.9%), Salmonella one case (1.9%), Pasteurella onecase (1.9%) and Klebsilla one case (1.9%). seventeen cases out of 53were mixed growth Escherichia coli and Staphylococcus Were 8 (15.1 %), Escherichia coli and Omithobacterium were 3 (5.7%) , Escherichia coliand Salmonella were one (1.9%), Escherichia coli and Proteus,Escherichia coli, Proteus and Omithobacterium were one (1.9%), E. coli, Proteus ,Streptococcus and Enterobacter were one (1.9%), Escherichia coli and Pseudomonas were one (1.9%), Pseudomonas and Staphylococcus were one (1.9%).and four(7.5) cases out of 53growth.