Table 1.

The antibacterial activities (diameter of inhibition zone, mm) of methanol and water extracts of the two plants against some pathogenic bacteria.

Plant used	Salvadora Persica		Commiphora gileadensis		Control antibiotic (Ampicillin
Test organisms	Methanol extract	Water extract	Methanol extract	Water extract
Fusobacterium nucleatum	23±4.1	20±0.2	21±1.1	20±0.2	28±0.12
Lactobacillus Casei	25±9.1	20±0.2	21±1.0	20±0.2	26±0.35
Staphylococcus aureus	25±3.2	20±0.2	21±2.2	19±0.2	28±0.54
Staphylococcus epidermidis	27±11.0	20±0.2	22±1.1	19±0.2	34±0.44
Streptococcus mutans	29±6.2	21±0.2	23±1.2	20±0.2	30±0.60
Streptococcus salivarius	23±4.4	15±0.2	19±2.0	16±0.2	30±0.31
Bacterial index**	25.5*	18.8*	20.17*	15.0*	30.5*

^**Bacterial index : Total activities against bacteria divided by the number of the tested bacteria

^*significant results at p<0.05 compared to control (DMSO).