scholarly journals Physiological and molecular characteristics of carbapenem resistance in Klebsiella pneumoniae and Enterobacter aerogenes

2016 ◽  
Vol 10 (06) ◽  
pp. 592-599 ◽  
Author(s):  
Rito Santo Pereira ◽  
Vanessa Cordeiro Dias ◽  
Alessandra Barbosa Ferreira-Machado ◽  
Juliana Alves Resende ◽  
André Netto Bastos ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Klebsiella Pneumoniae ◽  
Genetic Markers ◽  
Bacterial Resistance ◽  
Enterobacter Aerogenes ◽  
Carbapenem Resistance ◽  
Tertiary Hospital ◽  
Resistant Bacteria ◽  
Molecular Characteristics ◽  
Carbapenem Resistant

Introduction: Bacterial resistance is a growing concern in the nosocomial environment in which Klebsiella pneumoniae and Enterobacter aerogenes play an important role due to their opportunism and carbapenemase-production. This work aimed to evaluate physiological and molecular characteristics of carbapenem-resistant K. pneumoniae and E. aerogenes isolated in a Brazilian tertiary hospital. Methodology: In total, 42 carbapenem-resistant bacteria isolated from clinical specimens were included (21 K. pneumoniae and 21 E. aerogenes). Drug-sensitive K. pneumoniae (n = 27) were also included. Antimicrobial susceptibility and biocide tolerance patterns, hemolytic activity, tolerance to oxidative stress, and aggregative ability were assessed. Genetic markers related to carbapenem resistance, or ESBL-production were screened by PCR. Results: Compared to drug-sensitive strains, carbapenem-resistant K. pneumoniae were more tolerant to biocides and to oxidative stress, and they displayed an increase in biofilm formation. The genetic markers blaKPC (95.2%) and blaTEM (90.5%) were the most frequent. Among the carbapenem-resistant E. aerogenes strains, blaKPC, and blaTEM were detected in all bacteria. Drug-sensitive E. aerogenes were not isolated in the same period. blaSHV, blaVIM, and blaCTX markers were also observed among carbapenem-resistant bacteria. Conclusions: Results suggest that carbapenemase-producing enterobacteria might show peculiar characteristics regarding their physiology associated with their environmental persistency, virulence, and multidrug resistance. The observed phenomenon may have implications not only for antimicrobial chemotherapy, but also for the prognosis of infectious diseases and infection control.

scholarly journals Molecular characteristics of carbapenem-resistant Acinetobacter spp. from clinical infection samples and fecal survey samples in Southern China

2019 ◽  
Vol 19 (1) ◽  
Author(s):  
Si Li ◽  
Xiaonv Duan ◽  
Yuan Peng ◽  
Yongyu Rui
Keyword(s):  
Efflux Pump ◽  
Southern China ◽  
Variable Region ◽  
Carbapenem Resistance ◽  
Resistant Bacteria ◽  
Molecular Characteristics ◽  
Clinical Infection ◽  
High Genetic Diversity ◽  
Carbapenem Resistant ◽  
Opportunistic Bacteria

Abstract Background Carbapenem resistance among Acinetobacter species has become a life-threatening problem. As a last resort in the treatment of gram-negative bacteria infection, resistance to colistin is also a serious problem. The aim of study was to analyze the mechanism of resistance and perform genotyping of carbapenem-resistant Acinetobacter from clinical infection and fecal survey samples in Southern China. Methods One hundred seventy and 74 carbapenem-resistant Acinetobacter were isolated from clinical infection samples and fecal survey samples, respectively. We detected the related genes, including carbapenemase genes (blaKPC, blaIMP, blaSPM, blaVIM, blaNDM, blaOXA-23-like, blaOXA-24/40-like, blaOXA-51-like, and blaOXA-58-like), colistin resistance-related genes (mcr-1, mcr-2, mcr-3, mcr-4, and mcr-5), a porin gene (carO), efflux pump genes (adeA, adeB, adeC, adeI, adeJ, and adeK), mobile genetic element genes (intI1, intI2, intI3, tnpU, tnp513, IS26, ISAba1, and ISAba125), and the integron variable region. Genotyping was analyzed by enterobacterial repetitive intergenic consensus (ERIC)-PCR and dendrogram cluster analysis. Results Among the 244 carbapenem-resistant Acinetobacter, the common carbapenemase-positive genes included the following: blaOXA-51-like, 183 (75.00%); blaOXA-23-like, 174 (71.30%); blaNDM-1, 57 (23.40%); and blaOXA-58-like, 30 (12.30%). The coexistence of mcr-1 and blaNDM-1 in five strains of A. junii was found for the first time. Eleven distinct carO gene variants were detected in 164 (67.20%) strains, and ten novel variants, which shared 92–99% identity with sequences in the Genbank database, were first reported. Efflux system genes were present in approximately 70% of the isolates; adeABC and adeIJK were observed in 76.23 and 72.13%, respectively. Class 1 integrons were detected in 180 (73.80%) strains and revealed that four gene cassette arrays contained 11 distinct genes. The genotyping by ERIC-PCR demonstrated a high genetic diversity of non-baumannii Acinetobacter, and greater than 90% similarity to A. baumannii. Conclusions The blaNDM-1 gene was identified in up to 77% of the carbapenem-resistant Acinetobacter isolated from fecal survey samples, indicating that the gut might be a reservoir of resistant opportunistic bacteria. Intestinal bacteria can be transmitted through the fecal-hand, which is a clinical threat, thus, the monitoring of carbapenem-resistant bacteria from inpatients’ feces should be improved, especially for patients who have been using antibiotics for a long time.

scholarly journals Comparative analysis of Clinial Carbapenem- Resistant (CR), Hypermucoviscous (HM) and CR-HM Klebsiella pneumoniae isolates in China

2020 ◽  
Author(s):  
Jun-Ying Zhu ◽  
Guang-Yu Wang ◽  
Qing Wei ◽  
Zhen Shen ◽  
Qiong Li ◽  
...  
Keyword(s):  
Klebsiella Pneumoniae ◽  
Virulence Genes ◽  
Carbapenem Resistance ◽  
Resistance Rate ◽  
Molecular Characteristics ◽  
Carbapenem Resistant ◽  
Recent Emergence ◽  
String Test

Abstract Background: Although carbapenem-resistant Klebsiella pneumoniae (CRKP) and hypermucoviscous K. pneumoniae (HMKP) were largely non-overlapping, the recent emergence of CR-HMKP has raised great alarm in the world. We compared the molecular characteristics of CRKP, HMKP and CR-HMKP isolates.Results: 220 cases of K. pneumoniae isolates was collected and identified between Jan 2015 and Dec 2016 from Renji Hospital. Carbapenem resistance test and string test were performed to screen CRKP, HMKP and CR-HMKP isolates. All the CRKP, HMKP and CR-HMKP isolates were investigated for capsular genotyping, virulence genes and resistance genes by PCR and DNA sequencing. Multilocus sequence typing (MLST) was used to characterize isolates sequence types (STs). Serum killing assay and mouse lethality assay were respectively performed to confirm the virulence of the isolates in vitro and in vivo. Of 220 K. pneumoniae，71 HMKP, 84 CRKP and 8 CR-HMKP were identified. Resistance rate to carbapenems was significantly higher in CRKP than HMKP and CR-HMKP. For MLST and serotyping, ST23 (26.8%)，K1 (33.8%) and K2 (23.9%) serotypes were the most common in HMKP isolates while ST11 (84.5%, 100%) and K-nontypable (91.6%, 100%) were the predominant types in CRKP and CR-HMKP isolates. The existence of virulence genes rmpA, magA and iutA was significantly higher in HMKP while the prevalence of resistance gene blaKPC-2 was higher in CRKP and CR-HMKP. Virulence test in vivo and in vitro both showed the lower virulence of CRKP and CR-HMKP compared to HMKP.Conclusions: In spite of low virulence, the emergence of CR-HMKP indicates a confluence of hypermucoviscous phenotype and carbapenem resistance. Furthermore, the similar molecular characteristics between CRKP and CR-HMKP suggested that CR-HMKP might evolve from CRKP.

scholarly journals Prevalence and mechanisms of carbapenem resistance  among  Klebsiella aerogenes  in a tertiary hospital in China

2020 ◽  
Author(s):  
Luxiang Liu ◽  
Jingjing Quan ◽  
Dongdong Zhao ◽  
Weichao Liao ◽  
Jiaojian Lv ◽  
...  
Keyword(s):  
Intensive Care ◽  
Efflux Pump ◽  
Carbapenem Resistance ◽  
Clonal Diversity ◽  
Tertiary Hospital ◽  
Molecular Characteristics ◽  
Klebsiella Aerogenes ◽  
Carbapenem Resistant ◽  
Efflux Pump Inhibition ◽  
Clonal Spread

Abstract Background: Klebsiella aerogenes has emerged as one of the most important nosocomial pathogens for patients in intensive care units (ICU) in recent years. This study aims to evaluated the prevalence and molecular characteristics of clinical carbapenem-resistant K. aerogenes (CRKA) isolates in a tertiary hospital in China.Results: Twenty CRKA were identified among all the isolates, with the rate of 5.5% (20/364). Six CRKA isolates produced KPC-2 and 1 CRKA isolate produced NDM-1. PFGE and MLST indicated that the 20 CRKA strains were clonal diversity. All the bla KPC-2 gene and bla NDM-1 gene were located on plasmids and all the plasmids with bla KPC-2 and bla NDM-1 genes could successfully transferred to EC600 or J53. Twelve of 13 CRKA strains without any carbapenemase genes were positive for efflux pump inhibition test.Conclusion: Overall, the prevalence of CRKA in the tertiary hospital in Zhejiang Province of China is 5.5%. Only 35% of CRKA produce carbapenemase and efflux pumps might play an important role in the carbapenem resistance of K. aerogenes. It is necessary to strengthen the surveillance of carbapenem resistance in the hospital to prevent the horizontal and clonal spread of CRKA.

scholarly journals Prevalence of blaKPC-2, blaKPC-3 and blaKPC-30—Carrying Plasmids in Klebsiella pneumoniae Isolated in a Brazilian Hospital

Pathogens ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 332
Author(s):  
Letícia B. Migliorini ◽  
Romário O. de Sales ◽  
Paula C. M. Koga ◽  
Andre M. Doi ◽  
Anja Poehlein ◽  
...  
Keyword(s):  
Klebsiella Pneumoniae ◽  
Tertiary Hospital ◽  
Multidrug Resistant ◽  
Resistant Bacteria ◽  
Genomic Context ◽  
Multidrug Resistant Bacteria ◽  
Klebsiella Pneumoniae Carbapenemase ◽  
Carbapenem Resistant ◽  
Horizontal Spread ◽  
Widespread Dissemination

Klebsiella pneumoniae carbapenemase (KPC) actively hydrolyzes carbapenems, antibiotics often used a last-line treatment for multidrug-resistant bacteria. KPC clinical relevance resides in its widespread dissemination. In this work, we report the genomic context of KPC coding genes blaKPC-2, blaKPC-3 and blaKPC-30 in multidrug-resistant Klebsiellapneumoniae isolates from Brazil. Plasmids harboring blaKPC-3 and blaKPC-30 were identified. Fifteen additional carbapenem-resistant K. pneumoniae isolates were selected from the same tertiary hospital, collected over a period of 8 years. Their genomes were sequenced in order to evaluate the prevalence and dissemination of blaKPC–harboring plasmids. We found that blaKPC genes were mostly carried by one of two isoforms of transposon Tn4401 (Tn4401a or Tn4401b) that were predominantly located on plasmids highly similar to the previously described plasmid pKPC_FCF3SP (IncN). The identified pKPC_FCF3SP-like plasmids carried either blaKPC-2 or blaKPC-30. Two K. pneumoniae isolates harbored pKpQIL-like (IncFII) plasmids, only recently identified in Brazil; one of them harbored blaKPC-3 in a Tn4401a transposon. Underlining the risk of horizontal spread of KPC coding genes, this study reports the prevalence of blaKPC-2 and the recent spread of blaKPC-3, and blaKPC-30, in association with different isoforms of Tn4401, together with high synteny of plasmid backbones among isolates studied here and in comparison with previous reports.

scholarly journals Surveillance of Carbapenem-Resistant Klebsiella pneumoniae: Tracking Molecular Epidemiology and Outcomes through a Regional Network

2014 ◽  
Vol 58 (7) ◽  
pp. 4035-4041 ◽  
Author(s):  
David van Duin ◽  
Federico Perez ◽  
Susan D. Rudin ◽  
Eric Cober ◽  
Jennifer Hanrahan ◽  
...  
Keyword(s):  
Klebsiella Pneumoniae ◽  
Long Term Care ◽  
Carbapenem Resistance ◽  
The United States ◽  
Molecular Characteristics ◽  
Regional Network ◽  
Term Care ◽  
Content Type ◽  
Carbapenem Resistant

ABSTRACTCarbapenem resistance in Gram-negative bacteria is on the rise in the United States. A regional network was established to study microbiological and genetic determinants of clinical outcomes in hospitalized patients with carbapenem-resistant (CR)Klebsiella pneumoniaein a prospective, multicenter, observational study. To this end, predefined clinical characteristics and outcomes were recorded andK. pneumoniaeisolates were analyzed for strain typing and resistance mechanism determination. In a 14-month period, 251 patients were included. While most of the patients were admitted from long-term care settings, 28% of them were admitted from home. Hospitalizations were prolonged and complicated. Nonsusceptibility to colistin and tigecycline occurred in isolates from 7 and 45% of the patients, respectively. Most of the CRK. pneumoniaeisolates belonged to repetitive extragenic palindromic PCR (rep-PCR) types A and B (both sequence type 258) and carried eitherblaKPC-2(48%) orblaKPC-3(51%). One isolate tested positive forblaNDM-1, a sentinel discovery in this region. Important differences between strain types were noted; rep-PCR type B strains were associated withblaKPC-3(odds ratio [OR], 294; 95% confidence interval [CI], 58 to 2,552;P< 0.001), gentamicin nonsusceptibility (OR, 24; 95% CI, 8.39 to 79.38;P< 0.001), amikacin susceptibility (OR, 11.0; 95% CI, 3.21 to 42.42;P< 0.001), tigecycline nonsusceptibility (OR, 5.34; 95% CI, 1.30 to 36.41;P= 0.018), a shorter length of stay (OR, 0.98; 95% CI, 0.95 to 1.00;P= 0.043), and admission from a skilled-nursing facility (OR, 3.09; 95% CI, 1.26 to 8.08;P= 0.013). Our analysis shows that (i) CRK. pneumoniaeis seen primarily in the elderly long-term care population and that (ii) regional monitoring of CRK. pneumoniaereveals insights into molecular characteristics. This work highlights the crucial role of ongoing surveillance of carbapenem resistance determinants.

scholarly journals Epidemiological characteristics and antimicrobial susceptibility among carbapenem-resistant non-fermenting bacteria in Brazil

2016 ◽  
Vol 10 (06) ◽  
pp. 544-553 ◽  
Author(s):  
Vanessa Cordeiro Dias ◽  
Claudio Galuppo Diniz ◽  
Ana Claudia de Oliveira Peter ◽  
Andre Netto Bastos ◽  
Victor Quinnet de Andrade Bastos ◽  
...  
Keyword(s):  
Genetic Markers ◽  
Antimicrobial Susceptibility ◽  
Carbapenem Resistance ◽  
Diffusion Method ◽  
Resistant Bacteria ◽  
Disk Diffusion Method ◽  
Gram Negative ◽  
Carbapenem Resistant ◽  
Acinetobacter Spp ◽  
Epidemiological Characteristics

Introduction: Non-fermenting Gram-negative bacteria such as Pseudomonas aeruginosa and Acinetobacter baumannii are widespread in the environment and are increasingly associated with nosocomial infections. Extensive and indiscriminate use of antibiotics in hospitals has contributed to an increased number of infections caused by these microorganisms, that are resistant to a wide variety of antimicrobials, including β-lactams. This study aimed to isolate and identify carbapenem-resistant Acinetobacter spp. and P. aeruginosa from hospitalized patients, to determine their antimicrobial susceptibility patterns and to screen for blaOXA-23, blaOXA-24, blaOXA-51, blaOXA-58, and blaOXA-143 genes among the isolated bacteria. Methodology: Antimicrobial resistance patterns were performed using the disk-diffusion method. Genetic markers related to carbapenem resistance were screened by polymerase chain reaction. Results: Carbapenem-resistant Acinetobacter spp. (n = 44) and P. aeruginosa (n = 28) samples were isolated from patients admitted to a tertiary hospital. Polymyxin B was the only effective drug for all isolates. Considering the oxacillinase gene screening, genetic markers were observed only in Acinetobacter isolates. The most frequent genotype observed was blaOXA-23+/blaOXA-51+ (45.5%), followed by blaOXA-51+/blaOXA-143+ (41%). The oxacillinase genes blaOXA-24 and blaOXA-58 were not detected. High mortality rates (> 70%) were observed. Conclusions: The data suggest the need for rational use of antimicrobials associated with early diagnosis of multidrug-resistant bacteria, especially considering non-fermenting Gram-negative rods, which are widespread in hospitals. The findings of blaoxa-51‑ strains suggest the occurrence and spread of non-A. baumannii species throughout our hospitals. Effective implementation of surveillance programs in hospitals is needed to reduce infectious and resistant intra- and inter-species bacteria.

scholarly journals Role of efflux pumps inhibitor in decreasing antibiotic resistance of Klebsiella pneumoniae in a tertiary hospital in North India

2015 ◽  
Vol 9 (08) ◽  
pp. 815-820 ◽  
Author(s):  
Joel Filgona ◽  
Tuhina Banerjee ◽  
Shampa Anupurba
Keyword(s):  
Klebsiella Pneumoniae ◽  
Efflux Pumps ◽  
Tertiary Hospital ◽  
Multidrug Resistant ◽  
North India ◽  
Resistant Bacteria ◽  
Disk Diffusion Test ◽  
Carbapenem Resistant ◽  
Agar Dilution

Introduction: The contribution of efflux systems to drug resistance in Enterobacteriaceae is becoming increasingly appreciated. This study phenotypically analyzed the role of efflux mechanisms in resistance to ertapenem, doripenem, and tigecycline among clinical isolates of carbapenem-resistant Klebsiella pneumoniae (CRKP). Methodology: Multidrug-resistant and carbapenem non-susceptible K. pneumoniae isolates were determined by disk diffusion test. Further susceptibility of these isolates to carbapenems, ceftriaxone, cefoperazone, ceftazidime, tigecycline, and colistin was determined by agar dilution assay, and CRKP was identified. While modified Hodge test was used to confirm carbapenemase production, the contribution of efflux mechanisms was determined by a minimum inhibitory concentration (MIC) reduction assay, and typing was done by enterobacterial repetitive intergenic consensus (ERIC) polymerase chain reaction (PCR). Results: Of the 238 isolates of K. pneumoniae, 174 were multidrug resistant and 74 were CRKP. Forty of the CRKP were positive for carbapenemase production, while 43, 11, and 2 of the CRKP isolates had elevated MIC of ≥ 32 µg/mL for ertapenem, doripenem, and tigecycline, respectively. Twofold or higher MIC reduction to ertapenem, doripenem, and tigecycline was observed in 6, 28, and 27 isolates, respectively; however, non-susceptibility to ertapenem, doripenem and tigecycline was abolished in 2, 11, and 18 K. pneumoniae isolates, respectively. Nine clones of CRKP widely distributed within the hospital were obtained from ERIC PCR. Conclusions: Although colistin retained better activity against CRKP, efflux pumps contributed to increased MIC in ertapenem, doripenem, and tigecycline. Therefore, efflux systems are important aspects that should be explored in the fight against multidrug-resistant bacteria.  

scholarly journals Stool Samples of Acute Diarrhea Inpatients as a Reservoir of ST11 Hypervirulent KPC-2-Producing Klebsiella pneumoniae

mSystems ◽  
2020 ◽  
Vol 5 (3) ◽  
Author(s):  
Beiwen Zheng ◽  
Hao Xu ◽  
Tao Lv ◽  
Lihua Guo ◽  
Yu Xiao ◽  
...  
Keyword(s):  
Public Health ◽  
Klebsiella Pneumoniae ◽  
Carbapenem Resistance ◽  
Zhejiang Province ◽  
Public Health Issue ◽  
Resistant Bacteria ◽  
Phylogenetic Tree Analysis ◽  
Content Type ◽  
Carbapenem Resistant ◽  
Stool Samples

ABSTRACT The emergence and spread of carbapenem-resistant hypervirulent Klebsiella pneumoniae sequence type 11 (ST11-CR-HvKP) in China are a great concern in the public health community. However, the underlying mechanism that enables its wide dissemination in China remains unclear. Here, we investigated the prevalence of carriage of carbapenemase-producing Enterobacteriaceae (CPE) among inpatients with diarrhea in a teaching hospital over 1 year to identify ST11-CR-HvKP reservoirs and to understand the genetic background and plasmid profiles of these pathogens. As assessed by stool analysis, the CPE colonization rate (12.4%) among the inpatients with diarrhea was high (12.4%). Antibiotic exposure, surgical history, and CPE positivity were correlated. Genomic investigation of 65 carbapenem-resistant K. pneumoniae isolates indicated a shared bacterial population in various wards. According to maximum likelihood phylogenetic tree analysis, these isolates were partitioned into three major clades. Analysis of the wzi locus revealed three different K types (KL105, KL47, and K64) among the ST11 isolates, indicating the genetic diversity of these isolates. Genetic and sequence mapping revealed the complexity of virulence and resistance plasmid sets harbored by the isolates. These observations indicate that the dissemination of resistant bacteria is more complex than initially anticipated and possibly involves multiple K. pneumoniae ST11 lineages and a variety of virulence plasmids. Collectively, we show for the first time that stool may be a source of ST11-CR-HvKP isolates. Furthermore, the findings reveal the silent dissemination of ST11-CR-HvKP bacteria in Zhejiang Province, China. Future investigations are warranted to determine the association between rectal colonization by ST11-CR-HvKP and clinical infections. IMPORTANCE China has been experiencing a rapid increase in the number of nosocomial infections caused by carbapenem-resistant Klebsiella pneumoniae ST11 (ST11-CRKP) for decades. The emergence of hypervirulent ST11-CRKP (ST11-CR-HvKP) strains is expected to become a serious public health issue in China, considering that carbapenem resistance and virulence have converged in an epidemic clone. K. pneumoniae strains that colonize the human intestinal tract may become a reservoir of virulence and carbapenemase-encoding genes. Here, we first characterized the genotypes and antimicrobial phenotypes of ST11-CR-HvKP strains isolated from diarrheal stool samples of inpatients in Zhejiang Province, China. Active surveillance approaches based on the findings of the present study should be implemented, particularly in intensive care units, to combat the spread of ST11-CR-HvKP and to improve treatment.

scholarly journals An Outbreak of Carbapenem-Resistant Klebsiella pneumoniae in an Intensive Care Unit of a Major Teaching Hospital in Chongqing, China

2021 ◽  
Vol 11 ◽  
Author(s):  
Lingyi Zeng ◽  
Chengru Yang ◽  
Jisheng Zhang ◽  
Kewang Hu ◽  
Jingbo Zou ◽  
...  
Keyword(s):  
Intensive Care Unit ◽  
Intensive Care ◽  
Klebsiella Pneumoniae ◽  
Large Scale ◽  
Virulence Genes ◽  
Control Strategies ◽  
Resistant Bacteria ◽  
Molecular Characteristics ◽  
Dilution Method ◽  
Carbapenem Resistant

BackgroundDue to the critical condition and poor immunity of patients, the intensive care unit (ICU) has always been the main hospital source of multidrug-resistant bacteria. In recent years, with the large-scale use of antibiotics, the detection rate and mortality of carbapenem-resistant Klebsiella pneumoniae (CRKP) have gradually increased. This study explores the molecular characteristics and prevalence of CRKP isolated from the ICU ward of a tertiary hospital in China.MethodsA total of 51 non-duplicated CRKP samples isolated from the ICU were collected from July 2018–July 2020. The enzyme production of the strains was preliminarily screened by carbapenemase phenotypic test, and drug-resistant and virulence genes were detected by PCR. The transferability of plasmid was verified by conjugation test. The minimal inhibitory concentration (MIC) was determined by microbroth dilution method and genetic diversity was detected by multilocus sequence typing and pulsed-field gel electrophoresis.ResultsblaKPC-2 was the only carbapenemase detected. The major virulence genes were uge (100%), mrkD (94.1%), kpn (94.1%), and fim-H (72.5%), while wcag, ironB, alls and magA genes were not detected. One sequence type ST1373 strain, hypervirulent K. pneumoniae (hvKP), was detected. CRKP strains were highly resistant to quinolones, cephalosporins, aminoglycosides, and polymyxin, but susceptive to tigecycline and ceftazidime–avibactam. The success rate of conjugation was 12.2%, indicating the horizontal transfer of blaKPC-2. Homology analysis showed that there was a clonal transmission of ST11 CRKP in the ICU of our hospital.ConclusionThe present study showed the outbreak and dissemination in ICU were caused by ST11 CRKP, which were KPC-2 producers, and simultaneously, also carried some virulence genes. ST11 CRKP persisted in the ward for a long time and spread among different areas. Due to the widespread dispersal of the transferable blaKPC-2 plasmid, the hospital should promptly adopt effective surveillance and strict infection control strategies to prevent the further spread of CRKP. Ceftazidime–avibactam showed high effectiveness against CRKP and could be used for the treatment of ICU infections.

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