الفهرس 
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Abstract
Clostridial infection is associated with significant health problems in poultry
today. In this study the prevalence of C. perfringens was detected in different chicken flocks
at a rate of 32%. Also toxin-typing showed presence of cpa, cpb, etx, iap and cpe toxins
among the isolates. Net-B toxin is a novel toxin that had been recently identified in virulent
avian C. perfringens isolates. Antimicrobial sensitivity assays showed high resistance against
most common antibacterial drugs. Net-B toxin harboring isolates, originating from diseased
broiler, layer and breeder Egyptian chickens showed the lowest minimum inhibitory
concentration MICs values for the penicillin from β-lactams and tylvalosin from macrolides.