الفهرس 
AcknowledgementOnly 14 pages are availabe for public view
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Abstract
Fifty -Eight, duck flocks of different ages,rearing system and breeds (pekin, Muscovy and Muller),suffered from high morbidity and increased mortality, were examined from 2013 to 2015 in different of damietta Governorate. Clinical signs and post mortem examination were carried out. Two hundred and thirteen )2013) samples (169 from duck farms and 44 from the backyard )werw collected from internal organs , bone marrow, synovial fluids of arthritic joints and hydro-pericadial fluida from diseased and frshly dead ducks from positive bacterial isolation and subjected to isolation and identification of bacterial pathogens. Bacterial isolates were ( 81%, 76.9% ) from farms and backyard respectively.The most frequently isolated bacterial pathogens were E.coli , Salmonella spp, Proteuse spp, Enterococcus spp, pseeudomonas spp and Staphylococcus Aureus with incidence of ( 88.4% , 80%) ,(11.5% ,10%); (50%, 40%); (26.9%,20%);
(15.3%,0%) and (7.6% ,0%) from duck farms and backyards respectively.