TABLE 1.
Organism(s) (no. tested) |
% at indicated MIC (mg/liter) |
MIC50/MIC90 | |||||
---|---|---|---|---|---|---|---|
≤0.5 | 1 | 2 | 4 | ≥8 | |||
Enterobacteriaceae (96,847) | 74.9 | 3.9b | 0.6 | 0.4 | 20.3 | ≤0.5/>4 | |
WT group (79,474)c | 91.5 | 4.5b | 0.6 | 0.3 | 3.1 | ≤0.5/≤0.5 | |
IR group (17,373)d | 0.8 | 0.8b | 0.3 | 0.1 | 98.0 | >4/>4 | |
P. aeruginosa (23,685) | 20.0 | 50.8 | 28.6b | 0.5 | 0.1 | 1/2 | |
Acinetobacter spp. (6,796) | 44.5 | 37.9 | 12.1b | 2.2 | 3.4 | 1/2 |
aThe vertical line indicates the proposed breakpoint (≤2 mg/liter) for susceptibility.
bPerceived limit of WT population (ECOFF).
cWT, wild-type strain MICs, generally without resistance mechanisms (E. coli, Klebsiella spp., Enterobacter spp., Citrobacter spp.).
dIR, intrinsic resistance in genera/species (Proteus mirabilis, indole-positive Proteae, and Serratia marcescens).