Table 5. Antibacterial activity of P. halepensis essential oils from the West Northern of Algeria.

Microorganisms	Diameters of inhibition (mm)
Gram-positive bacteria
S. aureus	n.a
B. cereus	n.a
E. faecalis	9.0
L. monocytogenes	10.0
Gram-negative bacteria
P. aeruginosa	8.0
E. coli	n.a
Salmonella typhimurium	n.a
Acinetobacter baumanii	9.5
Citrobacter freundii	8.0
Proteus mirabilis	n.a
Klebsiella pneumoniae	10.0

Essential oil (10 µL/disc) of aerial part of P. halepensis; n.a: not active.