Table 3: Antibacterial activity of Al-Shifa 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 121±1.79 81±0.07 - - 900±0.19
Bacillus polymyxa 324±2.15 169±0.10 - - 729±3.46
Bacillus subtilis 256±0.39 121±0.19 - - 841±1.13
Staphylococcus aureus 289±3.67 169±1.17 - - 1225±4.63
Pseudomonas aeruginosa - - - - 225±0.06
Klebsiella pneumonia - - - - 361±2.31
Enterobecter - - - - 729±1.80
Escherichia coli - - - - 625±2.97

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