Studies on Edwardsiella tarda infection in catfish and Tilapia nilotica

Document Type : Original Article


1 Department of Microbiology, Faculty of Veterinary Medicine, Cairo University, Giza Egypt

2 Department of Fish Diseases and Management, Faculty of Veterinary Medicine, Cairo University, Giza Egypt


Edwardsiella tarda was recovered from cultured freshwater catfish (Claries gariepinus) with a prevalence rate of 0.42% in summer season. Experimental infectivity studies of E. tarda in Catfish and Tilapia nilotica were done using the intraperitoneal (I/P) and intramuscular (I/M) routes. Experimentally infected Catfish with a dose of 0.3 ml from E. tarda bacterial suspension of 108 CFU/ml manifested pathognomonic clinical signs and postmortem lesions than the experimentally infected Tilapia nilotica. Application of PCR technique for rapid detection of E. tarda infection in the experimentally infected fishes gave positive reaction in 4th day post infection in catfish and the 7th day post infection in Tilapia nilotica.


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