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In Vitro Synergistic Effect of Colistin and Ampicillin/Sulbactam With Several Antibiotics Against Clinical Strains of Multi-Drug Resistant Acinetobacter Baumannii Publisher Pubmed



Shafiee F1 ; Naji Esfahani SS2 ; Hakamifard A3 ; Soltani R4, 5
Authors
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Authors Affiliations
  1. 1. Department of Pharmaceutical Biotechnology, School of Pharmacy, Isfahan University of Medical Sciences, Isfahan, Iran
  2. 2. Students Research Committee, School of Pharmacy, Isfahan University of Medical Sciences, Isfahan, Iran
  3. 3. Department of Infectious Diseases, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
  4. 4. Department of Clinical Pharmacy and Pharmacy Practice, School of Pharmacy, Isfahan University of Medical Sciences, Isfahan, Iran
  5. 5. Infectious Diseases and Tropical Medicine Research Center, Isfahan University of Medical Sciences, Isfahan, Iran

Source: Indian Journal of Medical Microbiology Published:2021


Abstract

Purpose: Nowadays, Acinetobacter baumannii is resistant to almost all available antibiotics. The evaluation of synergistic effects between the antibiotics against this pathogen is among the efforts to counteract its antimicrobial resistance. This study aimed to evaluate possible synergistic effect of colistin and ampicillin/sulbactam (separately) with several antibiotics against clinical isolates of multi-drug resistant (MDR) A. baumannii. Methods: Acinetobacter baumannii strains were isolated from biological samples of hospitalized patients with any type of nosocomial infection related to this pathogen. Only MDR strains (resistance to at least three classes of antibiotics including cephalosporins, fluoroquinolones, and aminoglycosides) were included in the study. After determining the minimum inhibitory concentration (MIC) of antibiotics against the isolates by broth microdilution test, the checkerboard method was used for evaluation of any possible synergistic effect of both colistin and ampicillin/sulbactam with several other antibiotics. Results: Twenty isolates underwent synergy test for colistin and 20 isolates for ampicillin/sulbacatam. Doxycycline (55%), azithromycin (35%), and co-trimoxazole (35%) had the most frequency of synergistic effect with colistin. On the other hand, amikacin and gentamicin (55%), doxycycline (50%), co-trimoxazole (45%), azithromycin (40%), and cefepime (40%) had the most frequency of synergistic effect with ampicillin/sulbactam. No antagonistic effect was observed for both antibiotics. Conclusion: Colistin and ampicillin/sulbactam have substantial synergistic effect with several antibiotics especially doxycycline, co-trimoxazole, azithromycin, and amikacin (with ampicillin/sulbactam) against MDR strains of Acinetobacter baumannii. © 2021 Indian Association of Medical Microbiologists
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