TABLE 1.

Characteristics of the Salmonella strains and their transconjugants producing CTX-M-1 used in this studya

StrainbSerovarPFGE typeOriginYrMIC (μg/ml) of:Coresistance markerscIncI1 pMLSTdSGI1
CroCaz
03-8748NewportNDcHuman2003>2568Su, Tm
03-8748TC12562Su, Tm3
05-9280TyphimuriumXTYM-1Human2005>25632Cm, Spt, Str, Su, Tc, Tm+
05-9280TC1>25632Su, Tm3
06CEB6542SALLlandoffNDPoultry2006644Su, Tc
06CEB6542SALTC180.5Su, Tc3
06-6550TyphimuriumXTYM-115Human200625616Su, Tc, Tm
06-6550TC1644Su, Tm3
07-819LondonNDHuman2007>2568Su, Tm
07-819TC12564Su, Tm3
08-843TyphimuriumXTYM-1Human200825616Cm, Spt, Str, Su, Tc, Tm+
08-843TC12568Su, Tm3
08-1537TyphimuriumXTYM-117Human2008>25664Su, Tm
08-1537TC11288Su, Tm3
08-1745TyphimuriumXTYM-117Human2008>25616Su, Tm
08-2211TyphimuriumXTYM-117Human20082568Su, Tm
08-27124,5,12:i:−XTYM-30Human200825616Su, Tc, Tm
08-2712TC1648Su, Tm3
  • a Abbreviations: Caz, ceftazidime; Cm, chloramphenicol; Cro, ceftriaxone; Spt, spectinomycine; Str, streptomycin; Su, sulfonamide; Tc, tetracycline; Tm, trimethoprim; ND, not determined.

  • b Strains ending in “TC1” are E. coli transconjugant strains.

  • c Antibiotics other than β-lactams.

  • d IncI1 plasmid multilocus sequence type (pMLST), according to Garcia-Fernandez et al. (5), of the CTX-M-1 plasmids extracted from transconjugants.