Table 3.

Zone of inhibition (in mm) of combined plant extracts against different bacterial strains.

Plants	Concentration	Bacteria
		S. aureus		P. aeruginosa		E. coli		K. pneumoniae
	[mg/mL]
		Cli.	Sta.	Cli.	Sta.	Cli.	Sta.	Cli.	Sta.
CqEh	195	11.3±0.9 ad	13.0±0.0 ad	9.7±0.9 acd	14.0±0.6 acd	7.7±0.3 ad	8.7±0.9 ad	9.3±0.3 ad	10.7±0.3 ad
	390	15.0±0.6 a	16.0±0.6 a	14.0±0.6 ab	17.3±0.3 ab	10.7±0.3 a	10.7±0.3 ad	11.7±0.3 ad	13.0±0.0 a
	780	18.7±0.3 ab	19.7±0.3 ab	17.3±0.9 ab	19.3±0.9 ab	13.0±0.0 ab	14.3±0.9 abc	15.0±0.6 abc	15.0±0.6 ab
CqEp	195	13.0±0.6 ad	15.0±0.9 ad	11.0±0.6 acd	15.3±0.3 ad	10.7±0.3 ad	11.0±0.6 ad	8.7±0.3 acd	10.7±0.3 acd
	390	16.3±0.7 a	18.0±0.6 a	15.3±0.9 ab	18.3±0.3 a	13.3±0.9 a	14.3±0.3 a	12.0±0.6 ab	14.3±0.3 ab d
	780	19.3±2.0 ab	20.7±0.3 ab	18.0±0.0 ab	21.3±0.9 ab	16.3±0.3 ab	17.0±0.6 ab	14.3±0.3 ab	18.0±0.0 abc
EhEp	195	15.0±0.3 ad	18.0±0.6 ad	13.7±0.3 ad	13.3±0.3 acd	7.7±0.3 ad	8.7±0.3 ad	8.0±0.6 ad	8.3±0.3 ad
	390	18.7±0.3 a	21.7±0.9 a	16.3±0.3 a	17.3±0.9 ab	10.3±0.3 ad	12.0±0.6 a	10.3±0.3 a	10.7±0.3 a
	780	21.3±0.9 ab	23.3±0.3 ab	19.0±0.6 ab	20.3±0.3 ab	13.7±0.3 abc	14.0±0.0 ab	13.0±0.6 ab	13.3±1.3 ab
CqEhEp	195	15.3±0.3 ad	16.7±0.9 ad	14.7±0.3 ad	15.3±0.3 ad	9.0±0.6 ad	9.0±0.0 ad	11.3±0.7 acd	12.0±0.6 acd
	390	18.7±0.9 a	20.3±0.3 ad	17.7±0.3 a	18.0±0.6 ad	11.3±0.3 a	11.7±0.7 a	14.3±0.3 abd	15.7±0.3 ab
	780	22.3±0.7 b	24.7±0.9 bc	21.0±0.0b	22.7±0.3 abc	13.7±0.3 ab	14.7±0.3 ab	17.3±0.3 abc	18.7±0.7 ab
Gentamicin	0.025	26.0±0.6	28.7±0.6	23.3±0.7	26.3±0.3	21.7±0.6	24.3±0.9	22.7±0.9	25.3±0.3

The values are mean ± SEM (n=3); significant at P<0.05; ^a compared to gentamicin, ^b compared to 195mg/ml, ^c compared to 390mg/ml, and ^d compared to 780mg/ml; the negative control has shown no antibacterial activity. Sta.: standard (ATCC) strains; Cli.: clinically isolated strains; - - -: no activity; CqEh: C. quadrangularis and E. heterophylla; CqEp: C.quadrangularis and E. prostrata; EhEp: E. heterophylla and E. prostrata; and CqEhEp = C. quadrangularis, E. heterophylla, and E. prostrata