Antibacterial Activities of Five Medicinal Plants in Ethiopia against Some Human and Animal Pathogens

Table 3

The antibacterial activity of methanol extracts of five medicinal plants zone of inhibition in diameter (mm).

Plant species used	Concentration (mg/ml)	Mean zone of inhibition in diameter (mm)
		S. aureus	E. coli	P. aeruginosa
C. aurea (Ait.) Benth.	200	4.66	4.03	4.4
	100	3.66	3.3	3.43
	50	2.53	2.66	2.8
C. macrostachyus Del.	200	4.43	4.13	4.2
	100	2.86	3.0	2.86
	50	2.0	1.8	2.33
W. somnifera (L.) Dunal	200	3.96	4.03	4.26
	100	2.4	2.06	2.33
	50	1.7	1.7	1.7
N. tabacum L.	200	3.1	3.33	2.53
	100	2.86	2.8	2.86
	50	1.8	1.7	1.6
E. brucei Schwein.	200	0	0	0
	100	0	0	0
	50	0	0	0
Streptomycin	200	4.9	4.9	4.9
	100	4.9	4.9	4.9
	50	4.9	4.9	4.9
DMSO	200	0	0	0
	100	0	0	0
	50	0	0	0

NB: levels not connected by the same letter are significantly different.