Name of Antibiotic

Conc. (mcg)

Isolate 1

Isolate 2

Isolate 3

Isolate 4

Isolate 5

Isolate 6

Isolate 7

Isolate 8

Ceftriaxone

30

S

S

S

S

S

S

S

S

Chloramphenicol

30

S

S

S

S

S

S

S

S

Vancomycin

30

S

S

S

S

S

S

S

S

Netilmicin

30

S

S

S

S

S

S

S

S

Erythromycin

15

S

S

S

S

S

S

S

S

Ciprofloxacin

5

S

S

S

S

S

S

S

S

Cefuroxime

30

S

S

S

S

S

S

S

S

Amikacin

30

S

S

S

S

S

S

S

S

Gentamicin

10

S

S

S

S

S

S

S

S

Cloxacillin

1

S

S

S

S

S

S

S

S

Ampicillin

10

R

S

R

R

R

S

S

S

Ceftazidime

30

R

R

R

R

R

R

R

R

Cefepime

30

R

R

R

R

R

R

R

R

Cephalexin

30

R

R

S

R

S

R

R

S

Nalidixic Acid

30

R

R

R

R

R

R

R

R

Imipenem

30

S

S

S

S

R

S

S

S

Neomycin Sulphate

30

S

S

S

S

S

S

S

S

Polymyxin

30

S

S

S

S

S

S

S

S

Tetracycline

30

S

S

S

S

S

S

S

S

Cephataxime

30

S

S

S

S

S

S

S

S

Streptomycin

10

S

R

R

R

R

S

R

R

Trimethoprim

23.75

R

R

R

R

R

R

R

R

Table 3: Antibiotic Susceptibility Patterns of the 8 isolates of Serratia marcescens.