Exceptions or additions to the recognized standards

S = Susceptible; I = Intermediate; R = Resistant

 

Minimum Inhibitory

Concentrations (mcg/mL) 

Disk Diffusion

(zone diameters in mm)

Pathogen

S

I

R

S

I

R

Enterobacterales

≤ 4/4

8/4

≥ 16/4

≥ 21

18 – 20

≤ 17