Tested micro-organisms Inhibition zone diameter in (mm)* at different concentrations of methanol extract in (mg/ml)
50 25 12.5 6.25 3.1
Gram positive
Staphylococcus epidermidis
Staphylococcus aureus

16.5
17

12
16

-
14

-
-

-
-
Gram negative
Proteus sp.
Klebsiella sp.
Escherichia coli
Enterococcus sp.
Pseudomonas florescent

12.5
14
12
14.5
10

-
10
-
12
-

-
-
-
-
-

-
-
-
-
-

-
-
-
-
-
Fungi
Candida albicans

13.5

-

-

-

-
methanol (negative control) - - - - -
*Diameter of inhibition zones including diameter of well 6 mm.
– No inhibition was observed.
Values are given as mean of triplicate experiment.
Table 2: Antimicrobial activities of methanol extract of Zingiber officinale rhizomes and methanol (negative control).