Table 2. Antibacterial activities of black currant juice against E. coli and P. aeruginosa by paper disc diffusion assay

Treatments	mg/disc	Microorganisms
Treatments	mg/disc	E. coli (mm)	P. aeruginosa (mm)
Negative control (distilled water)		ND	ND
Positive control (streptomycin)	0.05	NT	16.83
Positive control (streptomycin)	0.01	18.31	NT
Black currant juice	30	14.87^A	12.52^A
	20	12.73^B	11.08^B
	10	9.71^C	8.76^C
	5	ND^D	ND^D
	2.5	ND^D	ND^D
	1.25	ND^D	ND^D
	SEM	0.118	0.038

The diameter of paper disc (8 mm) is included.
Means within a column with different superscript differ significantly at p<0.05.
ND, not detected; NT, not tested.