الفهرس 
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Abstract
This study was carried out on sixty-six rabbits weighting 1.75-2 Kg which were divided into 6 groups (1-6). Groups (1-3) without infection . Groups (4-6) orally infected with 5ml viable E.coli O 146 suspension (1.2x107 cfu ) . Gp.(1&4) were kept as control group for ather gps. Gp.(2&5) were Subcutaneous injected with Ceftiofur (.25 mg /1.5 kg B.W.) Daily for 10 days then stopping administration of drugs for 7 days . Gp. (3&6) were intramuscularly injected with Cefepime (100 mg /1.5 kg B.W.) daily for 10 days then stopping administration of drugs for 7 days. Each group contained 11 rabbits.