|
Antimicrobial agents
|
Concentration ranges used in the three media (mg/L)
|
Quality control rangea for E. coli ATCC 25922 (mg/L)
|
CLSI clinical breakpoint (mg/L)
|
EUCAST epidemiological cut-offs (mg/L)
|
|---|
| | | |
S
|
I
|
R
|
R
|
|
Ampicillin
|
0.25–128
|
2–8
|
≤ 8
|
16
|
≥32
|
> 8
|
|
Cephalothin
|
2–64
|
4–16
|
≤ 8
|
16
|
≥32
|
> 32
|
|
Chloramphenicol
|
1–128
|
2–8
|
≤ 8
|
16
|
≥32
|
> 16
|
|
Gentamycin
|
0.5–64
|
0.25–1
|
≤ 2
|
4
|
≥8
|
> 2
|
|
Streptomycin
|
2–128
|
4–16b
|
≤ 8
|
16
|
≥32
|
> 16
|
|
Cefotaxime
|
0.06–128
|
0.03–0.12
|
≤ 8
|
16–32
|
≥64
|
> 0.25
|
|
Sulfamethoxazole
|
8–1024
|
8–32
|
≤ 256
|
_
|
≥ 512
|
> 256
|
|
Oxytetracycline
|
0.25–256
|
0.5–2
|
≤ 4
|
8
|
≥16
|
> 8
|
- S, susceptible; I, intermediate; R, resistant.
- a CLSI standard for agar dilution susceptibility testing[11].
- b quality control range developed by the manufacturer Sensititre®
