الفهرس 
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Abstract
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 isolation and
identification of avian pathogen. The pathological part was designed to
report the pathological changes and correlate between it and the causative
agent. The samples were selected from thirty two farms from
different localities at Sharkia and AdDakahlia province suffering
respiratory signs through 4 seasons and include several ages and all
breeds. Only 53 cases selected from freshly dead or slaughtered and
collected for both microbiological and pathological examination.
The bacteriological result was among 53 cases 49 cases there were
bacterial growth. Thirty two (60.4) cases were single growth. Escherichia
coli 22 (41.5 %), Pseudomonas 4(7.5%), Staphylococcus 2(3.8%),
Proteus one case (1.9%), Salmonella one case (1.9%), Pasteurella one
case (1.9%) and Klebsilla one case (1.9%). seventeen cases out of 53
were mixed growth Escherichia coli and Staphylococcus Were 8 (15.1 %)
, Escherichia coli and Omithobacterium were 3 (5.7%) , Escherichia coli
and 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 53 were no
growth.