الفهرس 
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Abstract
Duck industry in Egypt and other countries in the world is
exposed to many diseases affecting growth rates and production
particularly bacterial causes. So this work aimed to study some
disease conditions of ducklings specially those causing respiratory
manifestations.
A total of 293 ducklings were collected from different
localities at Sharkia Governorate either in moribund state or freshly
dead. The examined samples yielded III positive bacterial isolates
from different organs. Theses isolates were 65 (58.56%)
Escherichia coli; 30(27.02%) Salmonella species ; 9( 8.11 %)
Pasteurella species; 6 (5.40%) Staphylococcus species; 1 (. 90%)
Riemerella; 8 (8.42%) mixed infection of Eicoli and Salmonella; 4
(5.40%) mixed infection of Pasteurella and E.coli; 2 (2.81 %) mixed
infection Staphylococci and Eicoli.
The prevalence of bacterial isolates in the different internal
organs of examined ducklings revealed that the percentage of Ecoli
isolates were 50.77%, 33.85%, 15.38% in liver, lung and heart
respectively. Meanwhile, the of Salmonella percentage were
43.33%, 23.33%, 16.67%, 10% and 6.67% in liver, kidney, heart,
lung and yolk sac respectively. While, Pasteurella percentages
were 55.56%, 33.33% and 11.11 % in liver, heart and lung. On other
hand, the Riemerella anatipestifer isolate was detected only in the
liver 100%.
All bacterial isolates of E.coli , Salmonellae,Pasteurellae and
Riemerella were biochemically identified with both conventional
biochemical test and API20 tests.