Antimicrobial drugs resistance of bacteria from carp (Cyprinus carpio) raised in a semi-intensive system

Abstract

The present work has the purpose to determine the susceptibility pattern to antimicrobial drugs of bacteria isolates from carps, using Kirb Bauer modified disk diffusion test. We analyzed 60 bacterial isolates from these groups: Staphylococcus spp. (27), Streptococcus spp. (03), Aeromonas spp. (15), Proteus spp. (04), Acinetobacter spp. (05), Pseudomonas spp. (01) and Enterobacteriaceae (05). The percentual of susceptibility was: amikacine (35%), amoxyciline (65%), apramycin (32%), ceftiofur (37%), doxycyline (32%), enrofloxacin (15%), josamycin (75%), lyncomicin (37%), nitrofurantoin (60%), nalidixic acid (32%), novobiocin (82%), penicillin (70%) and trimethoprim: sulfamethoxazole (40%). The multiple resistance ratios to antimicrobial drugs were from 0.33 to Streptococcus spp. to 0.71 Enterobacteriaceae bacteria. Thus, the highest resistance profile of the antimicrobial drugs tested was observed for novobiocin, while the lowest was observed for enrofloxacin. Bacterial isolates from carp showed multiple resistance to the drugs tested, with three isolates resistant to all tested antimicrobials.