A total of 18 Enterobacteriaceae (17 from gulls and 1 from a clinical sample) collected from Australia, carrying IncA/C plasmids with the IMP-encoding In809-like integrons, were studied. Seven plasmids, being representatives of different origins, plasmid sizes, replicon combinations, and resistance genes, were completely sequenced. Plasmid pEc158, identified in a clinical Escherichia coli ST752 isolate, showed extensive similarity to type 2 IncA/C2 plasmids. pEc158 carried none of the blaCMY-2-like region or ARI-B and ARI-A regions, while it contained a hybrid transposon structure. The six remaining plasmids, which were of wildlife origin, were highly similar to each other and probably were fusion derivatives of type 1 and type 2 A/C2 plasmids. The latter plasmids contained an ARI-B region and hybrid transposon structures. In all plasmids, hybrid transposon structures containing In809-like integrons were inserted 3,434 bp downstream of the rhs2 start codon. In all cases, the one outermost 38-bp inverted repeat (IR) of the transposon was associated with the Tn1696 tnp module, while the other outermost 38-bp IR of the transposon was associated with either a Tn6317-like module or a Tn21 mer module. However, the internal structure of the transposon and the resistance genes were different in each plasmid. These findings indicated that, for the specific periods of time and settings, different IncA/C2 plasmid types carrying In809-like elements circulated among isolates of wildlife and clinical origins. Additionally, they provided the basis for speculations regarding the reshuffling of IncA/C2 plasmids with In809-like integrons and confirmed the rapid evolution of IncA/C2 plasmid lineages.

• Klíčová slova
• Citrobacter freundii, Escherichia coli, IMP, Klebsiella pneumoniae, PMLST, metallo-β-lactamases,
• MeSH
• antibakteriální látky farmakologie   MeSH
• beta-laktamasy genetika   MeSH
• Charadriiformes mikrobiologie   MeSH
• Citrobacter freundii genetika   izolace a purifikace   MeSH
• Escherichia coli genetika   izolace a purifikace   MeSH
• Klebsiella pneumoniae genetika   izolace a purifikace   MeSH
• lidé MeSH
• mikrobiální testy citlivosti MeSH
• mnohočetná bakteriální léková rezistence genetika   MeSH
• obrácené repetice genetika   MeSH
• plazmidy genetika   MeSH
• sekvence nukleotidů MeSH
• sekvenční analýza DNA MeSH
• transpozibilní elementy DNA genetika   MeSH
• zvířata MeSH
• Check Tag
• lidé MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• Geografické názvy
• Austrálie MeSH
• Názvy látek
• antibakteriální látky MeSH
• beta-laktamasy MeSH
• transpozibilní elementy DNA MeSH

The complete nucleotide sequences of six IMP-4-encoding plasmids recovered from Enterobacteriaceae isolates of wildlife origin were characterized. Sequencing data showed that plasmids of different incompatibility groups (IncM, IncI1, IncF, and nontypeable [including an IncX5_2 and two pPrY2001-like]) carried the blaIMP-4-carrying integrons In809 or In1460. Most of the plasmids carried an mph(A) region, and chrA-like, aac(3)-IId, and blaTEM-1b genes. Finally, plasmid analysis revealed the involvement of two different IS26- and Tn1696-associated mechanisms in the mobilization of IMP-4-encoding integrons.

• Klíčová slova
• Enterobacter aerogenes, Escherichia coli, In1460, In809, IncF, IncI1, IncM, IncX5_2, Proteus mirabilis, Proteus penneri,
• MeSH
• antibakteriální látky farmakologie   MeSH
• Enterobacteriaceae genetika   patogenita   MeSH
• enterobakteriální infekce mikrobiologie   MeSH
• plazmidy genetika   MeSH
• přenos genů horizontální genetika   MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• Názvy látek
• antibakteriální látky MeSH

Escherichia coli ST216, including those that carry blaKPC-2, blaFOX-5, blaCTX-M-15 and mcr-1, have been linked to wild and urban-adapted birds and the colonisation of hospital environments causing recalcitrant, carbapenem-resistant human infections. Here we sequenced 22 multiple-drug resistant ST216 isolates from Australian silver gull chicks sampled from Five Islands, of which 21 carried nine or more antibiotic resistance genes including blaIMP-4 (n = 21), blaTEM-1b (n = 21), aac(3)-IId (n = 20), mph(A) (n = 20), catB3 (n = 20), sul1 (n = 20), aph(3")-Ib (n = 18) and aph(6)-Id (n = 18) on FIB(K) (n = 20), HI2-ST1 (n = 11) and HI2-ST3 (n = 10) plasmids. We show that (i) all HI2 plasmids harbour blaIMP-4 in resistance regions containing In809 flanked by IS26 (HI2-ST1) or IS15DI (HI2-ST3) and diverse metal resistance genes; (ii) HI2-ST1 plasmids are highly related to plasmids reported in diverse Enterobacteriaceae sourced from humans, companion animals and wildlife; (iii) HI2 were a feature of the Australian gull isolates and were not observed in international ST216 isolates. Phylogenetic analyses identified close relationships between ST216 from Australian gull and clinical isolates from overseas. E. coli ST216 from Australian gulls harbour HI2 plasmids encoding resistance to clinically important antibiotics and metals. Our studies underscore the importance of adopting a one health approach to AMR and pathogen surveillance.

• Klíčová slova
• Australian silver gull, Chroicocephalus novaehollandiae, ST216, anthropogenic pollution, urban birds, whole genome sequencing, wildlife,
• Publikační typ
• časopisecké články MeSH