Table 2

Distribution of the P. stuartii strains according to their epidemiological relationship, antimicrobial resistance phenotype, and IncA/C plasmid type

No. of strainsPulsotypeATBa no.Antimicrobial resistance phenotype of P. stuartii strains and their transconjugantsbIncA/C PCR profilecPlasmid size (kb)d
AMCzSSpGTASuTpCTeCp
48eA1AMCzSSpGTASuTpCTeg1 2 3 4 5 6 - - 9 10 11 12175
1A4SSpTASuTpCTe1 2 3 4 5 - - - - 10 11 12100
7fB2AMCzSSpTASuTpCTeCp1 2 3 4 5 6 7 8 9 10 11 12195
4B3AMCzSSpGTASuTpCTeCp1 2 3 4 5 6 7 8 9 10 11 12195
4C3AMCzSSpGTASuTpCTeCp1 2 3 4 5 6 7 8 9 10 11 12195
  • a ATB, antibiotype.

  • b AM, ampicillin; Cz, ceftazidime; S, streptomycin; Sp, spectinomycin; G, gentamicin; T, tobramycin; A, amikacin; Su, sulfonamides; Tp, trimethoprim; C, chloramphenicol; Te, tetracycline; Cp, ciprofloxacin.

  • c According to Welch et al. (52).

  • d Only the plasmids giving a positive hybridization with the repAIncA/C2 probe are indicated.

  • e Including five environmental strains.

  • f Including one environmental strain.

  • g —, sensitive phenotype except for ampicillin and gentamicin because the strains exhibited low-level resistance due to the basal expression of their chromosomal species-specific enzymes, AmpC (12) and AAC(2′)-I (16).