Recognized Interpretive Criteria

Additional FDA-identified interpretive criteria

 

Minimum Inhibitory
Concentrations
(mcg/mL)

Disk Diffusion
(zone diameter in mm)

Pathogen

S

I

R

S

I

R

Enterobacterales

≤2

4

≥8

≥19

16–18

≤15

Enterococcus faecalis

≤1

2

≥4

≥18

15–17

≤14

Staphylococcus spp.

M100 standard is recognized

Haemophilus influenzae and
parainfluenzae

M100 standard is recognized

Streptococcus pneumoniae

M100 standard is recognized

Anaerobes

M100 standard is recognized

Yersinia pestis

≤0.25

-

-

-

-

-

S = Susceptible; I = Intermediate; R = Resistant