Edwardsiellosis affected cultured O. niloticus showed haemorrhages allover the body especially at base of pectoral fins, operculum and belly, hemorrhagic mouth, protruded and congested vent, fin rot and exophthalmia. The isolated strains were identified biochemically as citrate negative and citrate positive E. tarda and the identification was confirmed by API20E system and PCR. The citrate negative isolate was highly pathogenic ... Read more