Table 2.

β-Lactam resistance phenotypes of 520 nonduplicateP. mirabilis strains resistant to amoxicillin

PhenotypebResistanceatoc:Synergy test resultNo. (%) of strains
AMXAMCTICTCCCF
PenicillinaseRS/IS/I/RSS/I407 (78.3)
ESBLRS/IRSR+74 (14.2)
IRT/OXARRS/IS/IS39 (7.5)
  • a S, susceptible; I, intermediate; R, resistant; S/I, susceptible or intermediate; S/I/R, susceptible, intermediate, or resistant. Based on the recommendations of the Antibiogram Committee of the French Society for Microbiology (2).

  • b See phenotype definitions in Materials and Methods.

  • c AMX, amoxicillin; AMC, amoxicillin-clavulanate; TIC, ticarcillin; TCC, ticarcillin-clavulanate; CF, cephalothin.