Background & Objective: Common antibiotics may be useless against multiple pathogens because of the multidrug resistance. Therefore, new ways of nanotechnology and effective herbal combination can be the solution for this problem. The objective of this study is to investigate the antimicrobial effect of Allicin, silver nano particles and their combination against skin infection due to Pseudomonas aeruginosa in animal model.

Materials & Methods: In this experimental study, Minimum Inhibitory Concentration (MIC) and Minimum Bactericidal Concentration (MBC) of Allicin, silver nano particles, and their combination were determined by macro dilution susceptibility test. Skin infection was produced in the shoulder region of 12 mice using Pseudomonas aeruginosa and the effect of ointment of Allicin, silver nano particles, and their combination were evaluated.

Results: The results showed that MIC and MBC of Allicin for pseudomonas aeruginosa were 2.38 and 4.77 mg/ml, respectively. MIC and MBC of silver nano particle for Pseudomonas aeruginosa were 3.12 and 6.25 ppm, respectively. MIC and MBC of combination of Allicin and silver nano particles on Pseudomonas aeruginosa were 0.59 mg/ml and 1.5 ppm, 1.19 mg/ml and 3.12 ppm, respectively. Anti-microbial effect of Allicin, silver nano particles and the synergistic activity of their combination against skin infections due to Pseudomonas aeruginosa was observed in animal model.

Conclusion: The results showed that Allicin in combination with silver nano particles have synergistic effect against skin infection due to Pseudomonas aeruginosa.