Table 3: Measurement of zone of inhibition.

Disc code (antibiotic name) (S. typhi)Ave. diameter of zone of inhibition (mm)Sensitivity pattern

Ampicillin2.5R
Cefuroxime5.5R
Ceftriaxone5.4R
Chloramphenicol17.3S
Ciprofloxacin6.5R
Ofloxacin15.2S
Amoxicillin3.5R
Augmentin5.2R

Key: S: sensitive, I: intermediate, R: resistant.