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Concurrent transfer and recombination between plasmids encoding for heat-stable enterotoxin and drug resistance in porcine enterotoxigenic Escherichia coli



Concurrent transfer and recombination between plasmids encoding for heat-stable enterotoxin and drug resistance in porcine enterotoxigenic Escherichia coli



Medical Microbiology and Immunology 172(3): 137-147



The frequency of and genetic mechanisms for simultaneous transfer of genes encoding for tetracycline and sulfa-streptomycin resistance, heat-labile (LT) and heat-stable (ST-mouse) enterotoxin production in porcine enterotoxigenic E. coli to E. coli K12 were investigated. Seven E. coli strains of 0-group 149 were studied by conjugation and transformation experiments. All strains transferred tetracycline resistance plasmids at a high frequency. No interaction was observed between these plasmids and those encoding for LT production. Most tetracycline-resistant recipient cells were ST-mouse+ following recombination events between plasmids encoding for colicin B and ST-mouse production and plasmids encoding for tetracycline resistance. When selecting for sulfate or streptomycin resistance, a majority of the transconjugants were also ST-mouse+, as plasmids coding for sulfa and streptomycin were mobilized by the colicin B and ST-mouse encoding plsmid. Since the simultaneous transfer of genes encoding for drug resistance, colicin B and ST-mouse production are common events in vitro, they might also occur frequently in vivo during antibiotic selective pressure.

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Accession: 001324312

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PMID: 6358818



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