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Phytomedicine. 2014 Oct 15;21(12):1666-74. doi: 10.1016/j.phymed.2014.08.013. Epub 2014 Sep 15.

Synergistic effect of Myrtus communis L. essential oils and conventional antibiotics against multi-drug resistant Acinetobacter baumannii wound isolates.

Author information

1
Department of Biology and Ecology, Faculty of Sciences, University of Novi Sad, Trg Dositeja Obradovica 2, 21 000 Novi Sad, Vojvodina, Serbia.
2
Department of Chemistry, Biochemistry and environmental protection, Faculty of Sciences, University of Novi Sad, Trg Dositeja Obradovica 3, 21 000 Novi Sad, Vojvodina, Serbia.
3
Health Center "Aleksinac", Hygienic and Epidemiological Service, Momcila Popovica 114, 18220 Aleksinac, Serbia.
4
Department of Biology and Ecology, Faculty of Sciences, University of Novi Sad, Trg Dositeja Obradovica 2, 21 000 Novi Sad, Vojvodina, Serbia. Electronic address: petar.knezevic@dbe.uns.ac.rs.

Abstract

Acinetobacter baumannii is a rapidly emerging, highly resistant clinical pathogen with increasing prevalence. In recent years, the limited number of antimicrobial agents available for treatment of infections with multi-drug resistant (MDR) strains reinforced tendency for discovery of novel antimicrobial agents or treatment strategies. The aim of the study was to determine antimicrobial effectiveness of three Myrtus communis L. essential oils, both alone and in combination with conventional antibiotics, against MDR A. baumannii wound isolates. The results obtained highlighted the occurrence of good antibacterial effect of myrtle oils when administered alone. Using checkerboard method, the combinations of subinhibitory concentrations of myrtle essential oils and conventional antibiotics, i.e. polymixin B and ciprofloxacine were examined. The results proved synergism among M. communis L. essential oils and both antibiotics against MDR A. baumannii wound isolates, with a FIC index under or equal 0.50. Combination of subinhibitory concentrations of essential oils and ciprofloxacin most frequently reduced bacterial growth in synergistic manner. The similar has been shown for combination with polymyxin B; furthermore, the myrtle essential oil resulted in re-sensitization of the MDR wound isolates, i.e. MICs used in combination were below the cut off for the sensitivity to the antibiotic. Time-kill curve method confirmed efficacy of myrtle essential oil and polymyxin B combination, with complete reduction of bacterial count after 6h. The detected synergy offers an opportunity for future development of treatment strategies for potentially lethal wound infections caused by MDR A. baumannii.

KEYWORDS:

Acinetobacter baumannii; Antimicrobial agents; Essential oils/Myrtus communis; Multi-drug resistant; Synergism

PMID:
25442275
DOI:
10.1016/j.phymed.2014.08.013
[Indexed for MEDLINE]

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