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A 139,622-bp IncI1 ST71 conjugative plasmid pEC012 from an avian  Escherichia coli  D-ST117 strain was sequenced, which carried five IS 26 -bracketed resistance modules: IS 26 - fosA3 - orf1-orf2-Δorf3 -IS 26 , IS 26-fip -ΔIS Ecp1 - bla  CTX-M-65 -IS 903D - iroN -IS 26 , IS 26-ΔtnpR - bla  TEM-1 - rmtB -IS 26 , IS 26 - oqxAB -IS 26 , and IS 26 - floR - aac(3)-IV -IS 26 . The backbone of pEC012 was similar to that of several other IncI1 ST71 plasmids: pV408, pM105, and pC271, but these plasmids had different arrangements of multidrug resistance region. In addition, the novel IS Ec57  element was identified, which is in the IS 21  family. The stepwise emergence of multi-resistance regions demonstrated the accumulation of different resistance determinants through homologous recombination. To the best of our knowledge, this is the first study to identify a multidrug-resistant IncI1 ST71 plasmid carrying  bla  CTX-M-65 ,  rmtB ,  fosA3 ,  floR , and  oqxAB  in an avian  E. coli  ST117 strain.

frontiers in microbiology

Complete Sequence of pEC012, a Multidrug-Resistant IncI1 ST71 Plasmid Carrying blaCTX-M-65, rmtB, fosA3, floR, and oqxAB in an Avian Escherichia coli ST117 Strain