الفهرس 
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Abstract
The present study was designed to investigate effect of ceftriaxone and vitamin E either alone or together in E.coli infected broiler chicks experimentally infected with E.coli in addition deter-mination of its residues using high performance liquid chroma-tography (HPLC) in both healthy and infected broilers.
In vitro studies:
a-Isolation of E. coli:
Cultivation of sample of infected chickens on macConkey agar media, showed growth of pink (red) color colonies but on eosin methylene blue agar, showed green-metallic colonies after 24 hrs. of incubation at 37ºC.
b- Sensitivity of E. coli to ceftriaxone compared with other antibiotics (disc-diffusion method):
The results of sensitivity test showed that ceftriaxone had more potent inhibitory effect on E. coli than other antimicrobial agent tested.