الفهرس 
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Abstract
In this investigation, the trials of bacterial isolation, identification of isolates either biochemically or serologically from apparently healthy free flying birds especially Sparrows were carried out. The experimental infection of chicks with identified isolates from free flying birds and sensitivity test in vitro to identified isolates were carried out. Our findings can be summarized as follows:
(1) The primary isolation, biochemical identification and differention of the bacterial isolates from 200 cloacal swabs of apparently healthy free flying birds gave the following:-
40 ¶. coh, 9 salmonella, 22 proteus, 10 I?febsiella, 12 sfizgeffa and 15cetrobacter isolates. Moreover, the bacterial isolates from 200 nasal swabs of apparently healthy free flying birds differentiated into 26 isolates of staphyococcus spp. and 4 pseudomonas isolates.
(2) The serological identification of ~E..cou isolates were subgrouped into 4 serotypes: 02, 0114, 0134, and 0142 also. Salmonella isolates were serologically identified into 2 salmonella strains, salmonella oranien5erg, and salmonella kgtthus.
(3) The experimental infection of identified chicks by different inoculation routes and oral) with a dose of 1 x 108 viable each serotype. The serotype 0142 & 02 while 0114 serotype was moderately serotype was non pathogenic. f&coli isolates to day-old (subcutaneous, intranasal microorganism I bird of were highly pathogenic, pathogenic and 0134
(4) The reisolation of inoculated ~E.co& serotypes was carried out from different organs of freshly dead and sacrificed chicks.
(5) The experimental infection of salmonella Oran.infierg isolate to day old chicks by oral route with a dose of 4 x io~ viable microorganisms I bird, showed that the organism was pathogenic to chicks.
(6) Antibiotic sensitivity- test was carried out to the isolated identified Sco(i and salmonellae isolates which revealed that ¶. ccli isolates were highly sensitive to enrofloxacin, flumoquine and showed nitrofurantoin, moderately sensitive to kanamycin, and showed varied sensitivity its to naladixic acid, gentamycin, streptomycin, chioramphenicol, ampicillin and tetracyclin, while all strains were resistant to colistin, penicillin and erythromycin. Also salmonella isolates were highly sensitive to flumoquine and enrofloxacin, moderately sensitive to neomycin, kanamycin, nitrofurantoin chloramphenicol, nalidexic acid and tetracycline and show low senstivity to trimethoprim, streptomcyin, gentamycin, and ampicillin, meanwhile they were resistant to colistin, penicillin, erythromycin and lincomycin.