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Susceptibility of six bacterial pathogens of channel catfish to six antibiotics



Susceptibility of six bacterial pathogens of channel catfish to six antibiotics



Journal of Aquatic Animal Health 7(3): 211-217



Two hundred eight bacterial isolates from diseased channel catfish Ictalurus punctatus were screened for susceptibility to apramycin, enrofloxacin, cephalothin, oxytetracycline, sulfadimethoxine-ormetoprim, and tilmicosin by the Kirby-Bauer disk diffusion method. Bacteria evaluated were Edwardsiella ictaluri, E. tarda, Acromonas sp., A. hydrophila, A. sobria, and Pseudomonas sp. All bacteria were most susceptible to enrofloxacin (99.0%) and apramycin (97.6%), but only 86.5% were susceptible to sulfadimethoxine-ormetoprim, 84.1% to oxytetracycline, and 75.5% to cephalothin. Edwardsiella ictaluri, E. tarda, A. hydrophila, and A. sobria were 100% susceptible to enrofloxacin. Aeromonas sp., E. ictaluri and E. tarda were 100% susceptible to apramycin. Resistance was detected in all bacterial species to cephalothin, oxytetracycline, sulfadimethoxine-ormetoprim, and tilmicosin. Testing E. ictaluri against sulfadimethoxine-ormetoprim gave larger zones of inhibition on Mueller-Hinton medium than on brain-heart infusion agar.

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Accession: 002973374

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DOI: 10.1577/1548-8667(1995)007<0211:sosbpo>2.3.co;2


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