Molecular epidemiology of carbapenem-resistant Acinetobacter baumannii group in Taiwan
ABSTRACT Acinetobacter, particularly the Acinetobacter baumannii group, is a major cause of nosocomial infections, and carbapenem-resistant Acinetobacter spp. are important human pathogens. We collected 492 Acinetobacter spp. strains from two hospitals in Taiwan and classified them using MALDI-TOF M...
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American Society for Microbiology
2025-01-01
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| Online Access: | https://journals.asm.org/doi/10.1128/msphere.00793-24 |
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| author | Tran Lam Tu Quyen Yu-Chia Hsieh Shiao-Wen Li Lii-Tzu Wu Ya-Zhu Liu Yi-Jiun Pan |
| author_facet | Tran Lam Tu Quyen Yu-Chia Hsieh Shiao-Wen Li Lii-Tzu Wu Ya-Zhu Liu Yi-Jiun Pan |
| author_sort | Tran Lam Tu Quyen |
| collection | DOAJ |
| description | ABSTRACT Acinetobacter, particularly the Acinetobacter baumannii group, is a major cause of nosocomial infections, and carbapenem-resistant Acinetobacter spp. are important human pathogens. We collected 492 Acinetobacter spp. strains from two hospitals in Taiwan and classified them using MALDI-TOF MS and blaOXA-51-like PCR; 94.5% were A. baumannii, and 5.5% were non-A. baumannii (NAB). We confirmed their identity by rpoB gene sequencing of 239 randomly selected A. baumannii strains and all 27 NAB strains. Our analysis revealed that the rpoB alleles of OXA51-like-negative strains matched those of two NAB species, A. seifertii and A. nosocomialis, while all OXA51-like-positive strains matched A. baumannii, as per the Pasteur MLST scheme database. Among the 492 strains, 240 exhibited carbapenem resistance, including 237 carbapenem-resistant A. baumannii (CRAB) strains and three CR-NAB strains. All CRAB strains were positive for blaOXA-51-like; 72.6% also carried blaOXA-23-like, 22.8% carried blaOXA-24-like, 3.4% co-carried blaOXA-23-like+blaOXA-24-like, and 1.27% carried blaOXA-51-like alone. Among the three CR-NAB strains, one carried blaNDM-1, and two co-carried blaOXA-58-like+blaIMP. We also established a new multiplex PCR method for rapid screening of common capsular types (KL), which showed a difference between CRAB and carbapenem-susceptible A. baumannii (CSAB). KL2, KL10, KL22, and KL52 accounted for 76.6% of CRAB strains, whereas about half of the CSAB strains were other KL types. Of the remaining CSAB strains, KL14 was the most predominant type at 10.3%. We further conducted MLST Pasteur typing for 262 isolates and found that the carbapenemase genes were correlated with either ST or KL types. Additionally, KL types showed correlations with ST types, carbapenem resistance, and certain clinical records. Whole-genome sequencing of a blaNDM-1-carrying A. seifertii strain revealed a plasmid transferable via in vitro conjugation, suggesting A. seifertii may be a reservoir for NDM-1 plasmids.IMPORTANCECarbapenem-resistant Acinetobacter spp. have been identified by the World Health Organization as a top priority for new antibiotic development. We established a rapid KL-typing method for efficient screening of Acinetobacter baumannii strains to enable epidemiological surveillance and provide a foundation for effective infection control. Our investigation of the molecular epidemiology of the A. baumannii group isolates revealed the prevalence of carbapenemase genes and major KL types among CR and CS strains of A. baumannii and NAB. We identified an A. seifertii strain carrying a Ti-type conjugative operon on a small plasmid that harbored genes encoding the NDM-1 carbapenemase alongside genes conferring resistance to aminoglycosides and bleomycin and closely resembled sequences detected in A. soli and A. pittii in Taiwan and China, respectively, suggesting its potential for transmitting multidrug resistance and contributing to the spread of antimicrobial resistance. |
| format | Article |
| id | doaj-art-bc8de4e4392744e380a320ec92eccaed |
| institution | Kabale University |
| issn | 2379-5042 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | American Society for Microbiology |
| record_format | Article |
| series | mSphere |
| spelling | doaj-art-bc8de4e4392744e380a320ec92eccaed2025-01-28T14:00:57ZengAmerican Society for MicrobiologymSphere2379-50422025-01-0110110.1128/msphere.00793-24Molecular epidemiology of carbapenem-resistant Acinetobacter baumannii group in TaiwanTran Lam Tu Quyen0Yu-Chia Hsieh1Shiao-Wen Li2Lii-Tzu Wu3Ya-Zhu Liu4Yi-Jiun Pan5Department of Biological Science and Technology, College of Life Science, China Medical University, Taichung, TaiwanDepartment of Pediatrics, Chang Gung Children’s Hospital, Chang Gung Memorial Hospital, Chang Gung University, College of Medicine, Taoyuan, TaiwanDepartment of Life Sciences, National University of Kaohsiung, Kaohsiung, TaiwanDepartment of Microbiology and Immunology, School of Medicine, College of Medicine, China Medical University, Taichung, TaiwanDepartment of Microbiology and Immunology, School of Medicine, College of Medicine, China Medical University, Taichung, TaiwanDepartment of Microbiology and Immunology, School of Medicine, College of Medicine, China Medical University, Taichung, TaiwanABSTRACT Acinetobacter, particularly the Acinetobacter baumannii group, is a major cause of nosocomial infections, and carbapenem-resistant Acinetobacter spp. are important human pathogens. We collected 492 Acinetobacter spp. strains from two hospitals in Taiwan and classified them using MALDI-TOF MS and blaOXA-51-like PCR; 94.5% were A. baumannii, and 5.5% were non-A. baumannii (NAB). We confirmed their identity by rpoB gene sequencing of 239 randomly selected A. baumannii strains and all 27 NAB strains. Our analysis revealed that the rpoB alleles of OXA51-like-negative strains matched those of two NAB species, A. seifertii and A. nosocomialis, while all OXA51-like-positive strains matched A. baumannii, as per the Pasteur MLST scheme database. Among the 492 strains, 240 exhibited carbapenem resistance, including 237 carbapenem-resistant A. baumannii (CRAB) strains and three CR-NAB strains. All CRAB strains were positive for blaOXA-51-like; 72.6% also carried blaOXA-23-like, 22.8% carried blaOXA-24-like, 3.4% co-carried blaOXA-23-like+blaOXA-24-like, and 1.27% carried blaOXA-51-like alone. Among the three CR-NAB strains, one carried blaNDM-1, and two co-carried blaOXA-58-like+blaIMP. We also established a new multiplex PCR method for rapid screening of common capsular types (KL), which showed a difference between CRAB and carbapenem-susceptible A. baumannii (CSAB). KL2, KL10, KL22, and KL52 accounted for 76.6% of CRAB strains, whereas about half of the CSAB strains were other KL types. Of the remaining CSAB strains, KL14 was the most predominant type at 10.3%. We further conducted MLST Pasteur typing for 262 isolates and found that the carbapenemase genes were correlated with either ST or KL types. Additionally, KL types showed correlations with ST types, carbapenem resistance, and certain clinical records. Whole-genome sequencing of a blaNDM-1-carrying A. seifertii strain revealed a plasmid transferable via in vitro conjugation, suggesting A. seifertii may be a reservoir for NDM-1 plasmids.IMPORTANCECarbapenem-resistant Acinetobacter spp. have been identified by the World Health Organization as a top priority for new antibiotic development. We established a rapid KL-typing method for efficient screening of Acinetobacter baumannii strains to enable epidemiological surveillance and provide a foundation for effective infection control. Our investigation of the molecular epidemiology of the A. baumannii group isolates revealed the prevalence of carbapenemase genes and major KL types among CR and CS strains of A. baumannii and NAB. We identified an A. seifertii strain carrying a Ti-type conjugative operon on a small plasmid that harbored genes encoding the NDM-1 carbapenemase alongside genes conferring resistance to aminoglycosides and bleomycin and closely resembled sequences detected in A. soli and A. pittii in Taiwan and China, respectively, suggesting its potential for transmitting multidrug resistance and contributing to the spread of antimicrobial resistance.https://journals.asm.org/doi/10.1128/msphere.00793-24capsular typeswzy multiplex PCRAcinetobacter baumannii groupcarbapenemase genes |
| spellingShingle | Tran Lam Tu Quyen Yu-Chia Hsieh Shiao-Wen Li Lii-Tzu Wu Ya-Zhu Liu Yi-Jiun Pan Molecular epidemiology of carbapenem-resistant Acinetobacter baumannii group in Taiwan mSphere capsular types wzy multiplex PCR Acinetobacter baumannii group carbapenemase genes |
| title | Molecular epidemiology of carbapenem-resistant Acinetobacter baumannii group in Taiwan |
| title_full | Molecular epidemiology of carbapenem-resistant Acinetobacter baumannii group in Taiwan |
| title_fullStr | Molecular epidemiology of carbapenem-resistant Acinetobacter baumannii group in Taiwan |
| title_full_unstemmed | Molecular epidemiology of carbapenem-resistant Acinetobacter baumannii group in Taiwan |
| title_short | Molecular epidemiology of carbapenem-resistant Acinetobacter baumannii group in Taiwan |
| title_sort | molecular epidemiology of carbapenem resistant acinetobacter baumannii group in taiwan |
| topic | capsular types wzy multiplex PCR Acinetobacter baumannii group carbapenemase genes |
| url | https://journals.asm.org/doi/10.1128/msphere.00793-24 |
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