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Characterization of Gentamicin Resistance in Enteric Bacteria Isolated From Pseudomys Scripta-Elegans From Commercial Turtle Farms.

Several genera of aminoglycoside resistant enteric bacteria were isolated from commercial turtle farms. Citrobacter freundii and Proteus vulgaris were the most prevalent organisms. Gentamicin resistance, measured by minimum inhibitory concentrations (MIC), ranged as high as 100 /Ltg/ml. While resistance to other antibiotics was detected in gentamicin-resistant isolates, no correlation was observed between antibiotic resistance and plasmid content. Spontaneous mutation to gentamicin could not account for the high levels of gentamicin resistance found in the original isolates. Regions of chromosomal DNA encoding gentamicin resistance of 100 fig/ml were obtained from two Citrobacter freundii, two Proteus vulgaris, and two Salmonella enteritidis strains. These recombinant plasmids imparted a level of gentamicin resistance to Escherichia coli similar to that observed in the resistant isolates. The resistance gene was located on a 858 base pair DNA fragment. This fragment was common to both Citrobacter strains and hybridized with chromosomal DNA from several gentamicin-resistant enterics. The nucleotide sequences of the resistance genes obtained from Citrobacter freundii, Proteus vulgaris and Salmonella enteritidis shared complete homology.