Research Article

Synergistic Effect between Usnic Acid and Polymyxin B against Resistant Clinical Isolates of Pseudomonas aeruginosa

Table 2

Antimicrobial activity of usnic acid against clinical isolates of Acinetobacter baumannii and Pseudomonas aeruginosa.

Clinical isolatesIdentification of the bacteriaMIC of usnic acid (μg/mL)

A15Acinetobacter spp.>500
A25Acinetobacter spp.>500
A71Acinetobacter spp.>500
A72Acinetobacter spp.>500
A76Acinetobacter spp.>500
PA05Pseudomonas aeruginosa500
PA07Pseudomonas aeruginosa500
PA18Pseudomonas aeruginosa500
PA19Pseudomonas aeruginosa500
PA46Pseudomonas aeruginosa250
PA56Pseudomonas aeruginosa250
PA57Pseudomonas aeruginosa500
PA78Pseudomonas aeruginosa500
PA82Pseudomonas aeruginosa250

MIC: minimum inhibitory concentration.