Table 1: Inhibition zone diameter standards for interpreting results after S. Typhi susceptibility testing for ciprofloxacin, according to Clinical and Laboratory Standards guidelines (2013)
| Disk potency |
Diameter (zone of inhibition) |
| 5μg |
>31mm |
21-30mm |
<20mm |
| Interpretation |
Susceptible (S) |
Intermediate (I) |
Resistant (R) |