الفهرس 
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Abstract
This work was carried out to investigate the
microbiological and parasitological relationship (E.coli, Salmonella and Eimeria) in healthy and diseased birds in commercial broiler chickens and some layer flocks in Kafr El-Seikh and Behera governorates.
The pathogenicity of E. coli isolates, effect of chemotherapeutic agents on E.coli isolates and characterization of isolated Salmonellae were studied. Parasitic infestation was done by microscopic examination of intestinal scrapings. The results and conclusions are summarized in the following:
1- Out of 24 broiler flocks and 4 layer flocks: 14 E.coli isolates and 6 Salmonella isolates were recovered while Eimeria sp. were present in 10 flocks from 24 broiler flocks.
2-. The 14 E.coli isolates were Congo Red E.coli positive on Congo red media and revealed 92.85, 91.83 % in embryo infected with 10 and CFU respectively.