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      Pan drug-resistant Acinetobacter baumannii causing nosocomial infections among burnt children

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          Abstract

          Background: Nosocomial infection caused by Acinetobacter baumannii has emerged as a world-wide serious problem in the emergence of multidrug-resistant (MDR). Infections caused by antibiotic-resistant strains of A. baumannii cannot be completely eliminated among the infected patients. This study aimed to monitor antibiotic resistance among A. baumannii strains isolated from burnt children.

          Methods: After performing biochemical identification tests on 115 isolates, 62 were detected as A. baumannii . Minimum inhibitory concentration (MIC) was used to test susceptibility to colistin, and disk agar diffusion was used for the susceptibility of the isolates to the antibiotics Ciprofloxacin, Amikacin, Gentamicin, Cefepime, Meropenem, Imipenem, Ceftazidime, Levofloxacin and Piperacillin/Tazobactam. Bacterial species were isolated and identified as multidrug-resistant (MDR), extensively drug-resistant (XDR) and pan drug-resistant (PDR), based on the susceptibility patterns to elected antibiotics, deputing different classes of antimicrobial.

          Results: The antibiotic susceptibility pattern out of a total of 62 bacterial strains used in this study. Thirty-six (58%) strains were categorized as MDR, 17 (27.5%) as XDR, and nine (14.5%) as PDR.

          Conclusion: To reduce the threat of antimicrobial resistance, MDR, XDR and PDR A. baumannii strains must be evaluated by all clinical microbiology laboratories.

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          The comprehensive antibiotic resistance database.

          Andrew McArthur, Nicholas Waglechner, Fazmin Nizam … (2013)
          The field of antibiotic drug discovery and the monitoring of new antibiotic resistance elements have yet to fully exploit the power of the genome revolution. Despite the fact that the first genomes sequenced of free living organisms were those of bacteria, there have been few specialized bioinformatic tools developed to mine the growing amount of genomic data associated with pathogens. In particular, there are few tools to study the genetics and genomics of antibiotic resistance and how it impacts bacterial populations, ecology, and the clinic. We have initiated development of such tools in the form of the Comprehensive Antibiotic Research Database (CARD; http://arpcard.mcmaster.ca). The CARD integrates disparate molecular and sequence data, provides a unique organizing principle in the form of the Antibiotic Resistance Ontology (ARO), and can quickly identify putative antibiotic resistance genes in new unannotated genome sequences. This unique platform provides an informatic tool that bridges antibiotic resistance concerns in health care, agriculture, and the environment.
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            Acinetobacter baumannii: epidemiology, antimicrobial resistance, and treatment options.

            Lisa Maragakis, Trish Perl (2008)
            Multidrug-resistant Acinetobacter baumannii is recognized to be among the most difficult antimicrobial-resistant gram-negative bacilli to control and treat. Increasing antimicrobial resistance among Acinetobacter isolates has been documented, although definitions of multidrug resistance vary in the literature. A. baumannii survives for prolonged periods under a wide range of environmental conditions. The organism causes outbreaks of infection and health care-associated infections, including bacteremia, pneumonia, meningitis, urinary tract infection, and wound infection. Antimicrobial resistance greatly limits the therapeutic options for patients who are infected with this organism, especially if isolates are resistant to the carbapenem class of antimicrobial agents. Because therapeutic options are limited for multidrug-resistant Acinetobacter infection, the development or discovery of new therapies, well-controlled clinical trials of existing antimicrobial regimens and combinations, and greater emphasis on the prevention of health care-associated transmission of multidrug-resistant Acinetobacter infection are essential.
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              The Success of Acinetobacter Species; Genetic, Metabolic and Virulence Attributes

              Anton Peleg, Anna de Breij, Mark Adams … (2012)
              An understanding of why certain Acinetobacter species are more successful in causing nosocomial infections, transmission and epidemic spread in healthcare institutions compared with other species is lacking. We used genomic, phenotypic and virulence studies to identify differences between Acinetobacter species. Fourteen strains representing nine species were examined. Genomic analysis of six strains showed that the A. baumannii core genome contains many genes important for diverse metabolism and survival in the host. Most of the A. baumannii core genes were also present in one or more of the less clinically successful species. In contrast, when the accessory genome of an individual A. baumannii strain was compared to a strain of a less successful species (A. calcoaceticus RUH2202), many operons with putative virulence function were found to be present only in the A. baumannii strain, including the csu operon, the acinetobactin chromosomal cluster, and bacterial defence mechanisms. Phenotype microarray analysis showed that compared to A. calcoaceticus (RUH2202), A. baumannii ATCC 19606T was able to utilise nitrogen sources more effectively and was more tolerant to pH, osmotic and antimicrobial stress. Virulence differences were also observed, with A. baumannii ATCC 19606T, A. pittii SH024, and A. nosocomialis RUH2624 persisting and forming larger biofilms on human skin than A. calcoaceticus. A. baumannii ATCC 19606T and A. pittii SH024 were also able to survive in a murine thigh infection model, whereas the other two species were eradicated. The current study provides important insights into the elucidation of differences in clinical relevance among Acinetobacter species.
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                Author and article information

                Journal
                Journal ID (nlm-ta): Med J Islam Repub Iran
                Journal ID (iso-abbrev): Med J Islam Repub Iran
                Journal ID (publisher-id): Med J Islam Repub Iran
                Journal ID (publisher-id): MJIRI
                Journal ID (publisher-id): Med J Islam Repub Iran
                Title: Medical Journal of the Islamic Republic of Iran
                Publisher: Iran University of Medical Sciences
                ISSN (Print): 1016-1430
                ISSN (Electronic): 2251-6840
                Publication date Collection: 2020
                Publication date (Electronic): 23 March 2020
                Volume: 34
                Page: 24
                Affiliations
                1Burn Research Center, Iran University of Medical Sciences, Tehran, Iran
                2Student Research Committee, Iran University of Medical Sciences, Tehran, Iran
                3Department of Microbiology, School of Medicine, Iran University of Medical Sciences Tehran, Iran
                4Shahid Beheshti University of Medical Sciences, Tehran, Iran
                5The Lister Laboratory of Microbiology, Tehran, Iran
                Author notes
                Corresponding author: Dr Atieh Darbandi, darbandi.a@ 123456iums.ac.ir
                Author information
                https://orcid.org/0000-0003-2323-761X
                Article
                DOI: 10.34171/mjiri.34.24
                PMC ID: 7293814
                PubMed ID: 32551313
                SO-VID: 6e2c8fb7-802c-428b-8b49-77af48beea6e
                Copyright © © 2020 Iran University of Medical Sciences
                License:

                This is an open-access article distributed under the terms of the Creative Commons Attribution NonCommercial-ShareAlike 1.0 License (CC BY-NC-SA 1.0), which allows users to read, copy, distribute and make derivative works for non-commercial purposes from the material, as long as the author of the original work is cited properly.

                History
                Date received : 04 October 2019
                Page count
                Figures: 2, Tables: 2, References: 17, Pages: 4
                Categories
                Subject: Original Article

                Keywords: pdr,acinetobacter baumannii,burnt children
                Data availability:
                Keywords: pdr, acinetobacter baumannii, burnt children

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