الفهرس 
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Abstract
1- In the present study a total of 307 ailing or freshly dead chicken of
different ages and different breeds representing 325000 birds and
39 flocks distributed in different localities were examined in the
Department of Avian Disease, Animal Health Research Institute
for presence of major bacterial infections. These birds were
brought from 12 provinces in upper and lower Egypt and also from
airport (imported broiler breeders).
2- Symptoms on the affected chickens were depression, off-food,
huddling together, ruffled feather, dropped wings, diarrhea,
respiratory signs and DROP in egg production.
3- Gross lesions were congested lungs, dark and swollen kidneys and
liver, unabsorbed yolk sac, pericarditis, perihepatitis, airsacculitis,
fibrinous pericarditis, fibrinous perihepatitis, ceasous airacculitis,
peritonitis and salpengitis.
4- Three hundred and seven chicken samples (166 broilers, 77 broiler
breeders and 64 commercial egg layers) were examined for aerobic
bacterial agents.
5- Aerobic bacterial infections were studied in different chicken
samples from different localities.
6- Bacterial isolates were morphologically and biochemically
identified and proved to be E.coli (36 isolates), salmonella species
(1 isolate), protues species (2 isolates), shigella species (2 isolate),
klebsiella species (1 isolate), staphylococcus species (3 isolates)
and streptococcus species (2 isolates).
7- Serological identification of E.coli isolates lead to recognition of
01,02,011,038,078,083,086,087,0107,0127 and 0153.
8- Distribution of E.coli 0-groups were studied in different chicken
samples (broilers, commercial egg layers and broiler breeders) and
in different localities.
9- The isolated salmonella is serologically identified to Salmonella
kuntakey.
10-Sensitivity tests of isolated E.coli 01 group and Salmonella
kuntakey were done in vitro.
11-Antimicrobial activity of Bacillus thuringiensis var kurstaki against
K colt 01 group and Salmonella kuntakey in vitro using agar gel
diffUsion test was proved.
12-Our study revealed that Bacillus thuringiensis var kurstaki has no
biological control on E.coli or Salmonella kuntakey infection in
chicks inoculated either orally or subcutaneously.
13- It is proved that Bacillus thuringiensis var kurstaki act as growth
inhibitor as indicated by the marked loss on body weight as
recorded in chicks treated with Bacillus thuringiensis and F. colt or
Salmonella kuntakey when compared with groups take the same
infection and not treated with Bacillus thuringiensis.
14- Histopathological changes for experimentally treated chicks with
Bacillus thuringiensis and infected with E.coli or Salmonella
kuntakey were studied.