Scrutinizing the effect of additive and synergistic antibiotics against carbapenem-resistant Pseudomonas aeruginosa

Abstract

Pseudomonas aeruginosa causes many infections worldwide. Multidrug-resistant bacteria are mostly watched in hospital-acquired infections and are linked with high mortality rates. This study aims to find a possible cure for P. aeruginosa by using an additive and synergistic combination of drugs. The Carbapenem-resistant P. aeruginosa were isolated and identified by using clinical and laboratory standards institute protocols and their antibiotic susceptibility testing was performed by using disc and well diffusion method. In computational analysis, all of the ligands and proteins were selected and docking was done using PYRX. Hundred samples were taken of isolated Gram-negative bacteria of which 25% were P. aeruginosa. Additive combinations (meropenem [MPM] + tobramycin [TOB] was 100% sensitive and imipenem + TOB was also 100% sensitive) and synergistic combinations (MPM + ciprofloxacin were 90% sensitive and amikacin and imipenem) were 100% sensitive according to CLSI protocol. In computational analysis, TOB gave the highest binding energy of −11.4, whereas MPM shows a binding energy of −9.3. In conclusion, Additive and synergistic combination of drugs showed good antibacterial activity against Pseudomonas aeruginosa. Hence it can be used as a good treatment option for P. aeruginosa.

Keywords

• p. aeruginosa
• meropenem
• ciprofloxacin
• tobramycin
• imipenem
• amikacin
• antibiotic susceptibility testing