Characterization of integrons and tetracycline resistance determinants in Aeromonas spp. isolated from South African aquaculture systems

Characterization and antimicrobial susceptibility of motile aeromonads isolated from freshwater ornamental fish showing signs of septicaemia

“…Tolerance to tetracycline and erythromycin was particularly widespread (> 50%), a finding that was in common with other comparable investigations of motile aeromonads from ornamental fish (Dias et al 2012, Sreedharan et al 2012. While tolerance of these antibiotics has likely resulted from their use in the aquarium fish industry, resistance can also arise from gene mutations or by acquisition of transferable genetic elements such as integrons (Jacobs & Chenia 2007). The observed levels of multi-resistance could be attributed to the horizontal spread of resistance genes, which is further supported by the presence of Class 1 integrons in 77% of the isolates.…”

Antimicrobial Resistance Patterns of Aeromonas spp. Isolated from Ornamental Fish

“…An increase in resistance levels of the genus Aeromonas, particularly to β-lactam antibiotics has been observed previously [10,11]. Antimicrobial resistance genes, including cassette-borne resistance genes in class I integrons, have been described as occurring in A. salmonicida and in motile aeromonads [12][13][14].…”

Resistance Determinants of Pseudomonas Species from Aquaculture in Australia

“…Streptomycin resistance gene aadA was detected in 28 of the 59 integrase positive strains; the primers used were specific for the detection of the aadA1a gene cassette and other closely related aadA gene cassettes (with the exception of aadA4 and aadA5). The presence of aadA and other resistance gene cassettes in different aquatic environments has been reported [33,35,37]; it is therefore not surprising to detect these genes in the isolates tested.…”

“…The association of integrons with various resistance gene cassettes in aquatic environments has been well documented [33][34][35][36][37], however there are few reports of integron and associated resistance genes in Pseudomonas spp. There is limited information on the occurrence of integrons and other resistance genes in bacteria of aquaculture origin in Australia [38,39].…”