Table 2: Antibacterial activity of Al-Nahal Natural honey against bacterial isolates. Data are shown as mean zone of inhibition (mm2) ± SD.

Organisms Honey concentrations +ve Control
Streptomycin
100% 75% 50% 25%
Bacillus alvei 441±1.25 361±3.36 225±1.15 121±2.10 900±4.11
Bacillus polymyxa 289±1.01 225±0.13 121±0.24 - 729±2.14
Bacillus subtilis 169±2.34 121±0.24 - - 841±0.75
Staphylococcus aureus 324±1.79 169±1.31 - - 841±2.66
Pseudomonas aeruginosa - - - - 169±2.11
Klebsiella pneumonia - - - - 121±1.21
Enterobecter - - - - 625±3.47
Escherichia coli - - - - 529±2.84

“+ve” means positive control, “–” means the absence of inhibition