Evaluating the frequency of carbapenem and aminoglycoside resistance genes among clinical isolates of Acinetobacter baumannii from Ahvaz, south-west Iran
Acinetobacter baumannii is one of the most important opportunistic challenging pathogens as a result of its ability to acquire resistance to broad range of antibiotics and cause a variety of severe nosocomial infections. We investigated the frequency of the aminoglycoside-modifying enzymes (AMEs) an...
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Elsevier
2020-11-01
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| Series: | New Microbes and New Infections |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2052297520301311 |
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| author | S.M. Mortazavi Z. Farshadzadeh S. Janabadi M. Musavi F. Shahi M. Moradi S. Khoshnood |
| author_facet | S.M. Mortazavi Z. Farshadzadeh S. Janabadi M. Musavi F. Shahi M. Moradi S. Khoshnood |
| author_sort | S.M. Mortazavi |
| collection | DOAJ |
| description | Acinetobacter baumannii is one of the most important opportunistic challenging pathogens as a result of its ability to acquire resistance to broad range of antibiotics and cause a variety of severe nosocomial infections. We investigated the frequency of the aminoglycoside-modifying enzymes (AMEs) and oxacillinase genes among clinical isolates of A. baumannii collected from hospitalized patients in Imam Khomeini Hospital, Ahvaz city, Iran. This prospective cross-sectional study was performed on 80 clinical isolates of A. baumannii collected from patients referred to Imam Khomeini Hospital in Ahvaz, Iran. Initial identification of isolates as A. baumannii was performed using conventional bacteriologic tests, and final confirmation was carried out by PCR of blaOXA-51-like gene and multiplex PCR of gyrB locus. MICs of different classes of antibiotics against these strains was measured by using VITEK 2 system. After extraction of genomic DNA, two groups of multidrug-resistant A. baumannii genes including AME (aadA1, aadB, aphA6 and aacC1) and oxacillinases (blaOXA-23-like, blaOXA-24-like, blaOXA-51-like, blaOXA-58-like and blaOXA-143-like) were detected. According to antibiotic susceptibility testing, among 80 A. baumannii strains, 75 isolates (91.25%) were multidrug resistant. The results showed that colistin and tigecycline, with respective sensitivity rates of 97.5% (78/80) and 56.25% (45/80), had the highest effects. The presence of blaOXA-51-like and gyrB genes was confirmed in all strains. Furthermore, blaOXA-23-like and blaOXA-24-like genes were found in 68.75% (55/80) and 20% (16/80) of isolates respectively, while no isolate harbored the blaOXA-143-like gene. The frequency of genes encoding the AMEs including aadA1, aacC1, aphA6 and aadB were 11.25% (9/80), 16.25% (13/80), 22.5% (18/80) and 30% (24/80) respectively. Our findings indicate that the presence of the aadB and aphA6 is correlated with high resistance against amikacin and gentamicin. We found a very high resistance rate against most of the antimicrobial agents usually prescribed for severe infections caused by A. baumannii. Therefore, because of rapid emergence of resistance even for colistin or tigecycline, monotherapy should be avoided. These results show the importance of providing antibiotics correctly in intensive care units and following antibiotic stewardship protocols as the only effective strategies to attempt to control antibiotic resistance in healthcare settings. |
| first_indexed | 2024-12-14T04:44:46Z |
| format | Article |
| id | doaj.art-1e0102fdb9a04c56a6f3d3a29c43bb30 |
| institution | Directory Open Access Journal |
| issn | 2052-2975 |
| language | English |
| last_indexed | 2024-12-14T04:44:46Z |
| publishDate | 2020-11-01 |
| publisher | Elsevier |
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| series | New Microbes and New Infections |
| spelling | doaj.art-1e0102fdb9a04c56a6f3d3a29c43bb302022-12-21T23:16:42ZengElsevierNew Microbes and New Infections2052-29752020-11-0138100779Evaluating the frequency of carbapenem and aminoglycoside resistance genes among clinical isolates of Acinetobacter baumannii from Ahvaz, south-west IranS.M. Mortazavi0Z. Farshadzadeh1S. Janabadi2M. Musavi3F. Shahi4M. Moradi5S. Khoshnood6Student Research Committee, School of Medicine, Bam University of Medical Sciences, Bam, IranInfectious and Tropical Diseases Research Center, Health Research Institute, Iran; Health Research Institute of Microbiology, School of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, IranDepartment of Bacteriology and Virology, School of Medicine, Shiraz University of Medical Sciences, Shiraz, IranStudent Research Committee, School of Medicine, Bam University of Medical Sciences, Bam, IranInfectious and Tropical Diseases Research Center, Health Research Institute, Iran; Health Research Institute of Microbiology, School of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, IranInfectious and Tropical Diseases Research Center, Health Research Institute, Iran; Health Research Institute of Microbiology, School of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, IranStudent Research Committee, School of Medicine, Bam University of Medical Sciences, Bam, Iran; Corresponding author: S. Khoshnood, Student Research Committee, School of Medicine, Bam University of Medical Sciences, Bam, Iran.Acinetobacter baumannii is one of the most important opportunistic challenging pathogens as a result of its ability to acquire resistance to broad range of antibiotics and cause a variety of severe nosocomial infections. We investigated the frequency of the aminoglycoside-modifying enzymes (AMEs) and oxacillinase genes among clinical isolates of A. baumannii collected from hospitalized patients in Imam Khomeini Hospital, Ahvaz city, Iran. This prospective cross-sectional study was performed on 80 clinical isolates of A. baumannii collected from patients referred to Imam Khomeini Hospital in Ahvaz, Iran. Initial identification of isolates as A. baumannii was performed using conventional bacteriologic tests, and final confirmation was carried out by PCR of blaOXA-51-like gene and multiplex PCR of gyrB locus. MICs of different classes of antibiotics against these strains was measured by using VITEK 2 system. After extraction of genomic DNA, two groups of multidrug-resistant A. baumannii genes including AME (aadA1, aadB, aphA6 and aacC1) and oxacillinases (blaOXA-23-like, blaOXA-24-like, blaOXA-51-like, blaOXA-58-like and blaOXA-143-like) were detected. According to antibiotic susceptibility testing, among 80 A. baumannii strains, 75 isolates (91.25%) were multidrug resistant. The results showed that colistin and tigecycline, with respective sensitivity rates of 97.5% (78/80) and 56.25% (45/80), had the highest effects. The presence of blaOXA-51-like and gyrB genes was confirmed in all strains. Furthermore, blaOXA-23-like and blaOXA-24-like genes were found in 68.75% (55/80) and 20% (16/80) of isolates respectively, while no isolate harbored the blaOXA-143-like gene. The frequency of genes encoding the AMEs including aadA1, aacC1, aphA6 and aadB were 11.25% (9/80), 16.25% (13/80), 22.5% (18/80) and 30% (24/80) respectively. Our findings indicate that the presence of the aadB and aphA6 is correlated with high resistance against amikacin and gentamicin. We found a very high resistance rate against most of the antimicrobial agents usually prescribed for severe infections caused by A. baumannii. Therefore, because of rapid emergence of resistance even for colistin or tigecycline, monotherapy should be avoided. These results show the importance of providing antibiotics correctly in intensive care units and following antibiotic stewardship protocols as the only effective strategies to attempt to control antibiotic resistance in healthcare settings.http://www.sciencedirect.com/science/article/pii/S2052297520301311Acinetobacter baumanniiaminoglycoside resistance genescarbapenem-resistant A. baumannii (CRAB)multidrug resistance (MDR)oxacillinase genes |
| spellingShingle | S.M. Mortazavi Z. Farshadzadeh S. Janabadi M. Musavi F. Shahi M. Moradi S. Khoshnood Evaluating the frequency of carbapenem and aminoglycoside resistance genes among clinical isolates of Acinetobacter baumannii from Ahvaz, south-west Iran New Microbes and New Infections Acinetobacter baumannii aminoglycoside resistance genes carbapenem-resistant A. baumannii (CRAB) multidrug resistance (MDR) oxacillinase genes |
| title | Evaluating the frequency of carbapenem and aminoglycoside resistance genes among clinical isolates of Acinetobacter baumannii from Ahvaz, south-west Iran |
| title_full | Evaluating the frequency of carbapenem and aminoglycoside resistance genes among clinical isolates of Acinetobacter baumannii from Ahvaz, south-west Iran |
| title_fullStr | Evaluating the frequency of carbapenem and aminoglycoside resistance genes among clinical isolates of Acinetobacter baumannii from Ahvaz, south-west Iran |
| title_full_unstemmed | Evaluating the frequency of carbapenem and aminoglycoside resistance genes among clinical isolates of Acinetobacter baumannii from Ahvaz, south-west Iran |
| title_short | Evaluating the frequency of carbapenem and aminoglycoside resistance genes among clinical isolates of Acinetobacter baumannii from Ahvaz, south-west Iran |
| title_sort | evaluating the frequency of carbapenem and aminoglycoside resistance genes among clinical isolates of acinetobacter baumannii from ahvaz south west iran |
| topic | Acinetobacter baumannii aminoglycoside resistance genes carbapenem-resistant A. baumannii (CRAB) multidrug resistance (MDR) oxacillinase genes |
| url | http://www.sciencedirect.com/science/article/pii/S2052297520301311 |
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