ANTIBIOTIC RESISTANCE OF Edwardsiella ictaluri ISOLATED FROM STRIPED CATFISH (Pangasianodon hypophthalamus) FINGERLINGS COLLECTED FROM TAY NINH, DONG THAP PROVINCES

Abstract

This study was conducted to determine the level of antibiotic resistance (against 10 tested antibiotics) of 75 Edwardsiella ictaluri strains isolated from striped catfish (Pangasianodon hypophthalamus) fingerlings collected from Tay Ninh, Dong Thap provinces. The results showed that those E. ictaluri strains exhibited high resistance to Ampicillin, Streptomycin, Trimethoprim/Sulfamethoxazol, Nalidixic Acid, Florfenicol with percentages of 61.3; 74.7; 97.3; 93.3 and 60.0%, respectively. None of the isolates was sensitive to all 10 tested antibiotics. The percentage of multiple resistant isolates from two to six tested antibiotics was 97.3%. The multiple antibiotic resistance (MAR) index values of 0.37 to 0.48 (of each sample collection site) indicated that these striped catfish can be raised in areas where antibiotics were commonly used.