Persistence of an antibiotic resistance plasmid in intestinal Escherichia coli of chickens in the absence of selective pressure.

Abstract:

:We studied eight strains of Escherichia coli resistant to high levels of trimethoprim that were isolated over a 6-week period in a commercial breeding flock of broilers. The strains originated from fecal samples and from a carcass immediately after slaughter. Seven of eight strains belonged to the same infrequent biotype. They were also resistant to ampicillin and streptomycin, and some were resistant to tetracycline and potassium tellurite. All the strains transferred trimethoprim and ampicillin resistance to E. coli. Analysis of the donors and of the transconjugants by agarose gel electrophoresis after digestion by restriction endonucleases and by nucleic acid hybridization indicated that resistance to trimethoprim (dfrI) and to ampicillin (bla TEM-1) was mediated by a 65-kilobase plasmid, pIP1531. Persistence of resistance to trimethoprim and ampicillin in this flock was therefore due to two cumulative factors, both occurring in the absence of selective pressure, namely the dissemination of a particular plasmid between strains and the ability of an atypical E. coli strain to stably colonize many animals.

authors

Chaslus-Dancla E,Gerbaud G,Lagorce M,Lafont JP,Courvalin P

doi

10.1128/aac.31.5.784

subject

Has Abstract

pub_date

1987-05-01 00:00:00

pages

784-8

issue

5

eissn

0066-4804

issn

1098-6596

journal_volume

31

pub_type

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