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Isabelle Casin, Jacques Breuil, Anne Brisabois, Frédérique Moury, Francine Grimont, Ekkehard Collatz, Multidrug-Resistant Human and Animal Salmonella typhimuvium Isolates in France Belong Predominantly to a DT104 Clone with the Chromosome- and Integron-Encoded β-Lactamase PSE-1, The Journal of Infectious Diseases, Volume 179, Issue 5, May 1999, Pages 1173–1182, https://doi.org/10.1086/314733
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Abstract
Epidemiologic relationships were investigated in 187 ampicillin-resistant Salmonella typhimurium strains (86 human, 101 animal) from >2000 strains isolated in 1994. Of 23 resistance patterns, the most frequent (ampicillin [Am], chloramphenicol [Cm], tetracycline [Tc], streptomycin and spectinomycin [Sm], and sulfonamides [Su]) was found in 69.5% of human and 64.8% of animal isolates. Four β-lactamase genes were identified, blaTEM (24%), blaPSE-1 (78%), and blaSHV and oxa-2 (each <3%). blaPSE-1 and the integrase gene, intII, but not blaTEM, blaSHV or oxa-2, were chromosomeborne and found almost exclusively in the AmCmTcSmSu strains. In these, polymerase chain reaction mapping revealed two distinct integrons carrying blaPSE-1 or aadA2. Lysotypes, plasmid profiles, and restriction fragment length polymorphisms (IS200) were determined for 50 representative isolates and for 3 DT104 strains from the United Kingdom (UK). The phage type of the PSE-1—producing AmCmTcSmSu strains was 12 atypic, indistinguishable from that of the DT104 strains. The combined data indicate that the same multiresistant clone has spread through human and animal ecosystems in the UK and France.
- ampicillin
- polymerase chain reaction
- plasmids
- chloramphenicol
- bacteriophages
- chromosomes
- clone cells
- ecosystems
- electrophoresis, gel, pulsed-field
- genes
- integrase
- restriction fragment length polymorphism
- salmonella typhimurium
- spectinomycin
- streptomycin
- salmonella
- sulfonamides
- tetracycline
- integrons