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Qiu J, Wei D, Ma J, Liu R, Shi J, Ren Q, Wei C, Huo B, Zhu L, Xiang T, Liu Y, Cheng N. Covert dissemination of pLVPK-like virulence plasmid in ST29-K54 Klebsiella pneumoniae: emergence of low virulence phenotype strains. Front Cell Infect Microbiol 2023; 13:1194133. [PMID: 37829609 PMCID: PMC10565659 DOI: 10.3389/fcimb.2023.1194133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2023] [Accepted: 09/01/2023] [Indexed: 10/14/2023] Open
Abstract
This study aimed to explore the epidemic, clinical characteristics, and molecular and virulence attributes of Klebsiella pneumoniae serotype K54 (K54-Kp). A retrospective study was conducted on 328 strains of Klebsiella pneumoniae screened in a Chinese hospital from January 2016 to December 2019. The virulence genes and antibiotic resistance genes (ARGs) were detected by PCR, and a drug sensitivity test was adopted to detect drug resistance. Multilocus sequence typing (MLST) and PFGE were performed to determine the clonal correlation between isolates. Biofilm formation assay, serum complement-mediated killing, and Galleria mellonella infection were used to characterize the virulence potential. Our results showed that thirty strains of K54-Kp were screened from 328 strains of bacteria, with an annual detection rate of 2.29%. K54-Kp had a high resistance rate to antibiotics commonly used in the clinic, and patients with hepatobiliary diseases were prone to K54-Kp infection. MLST typing showed 10 sequence typing, mainly ST29 (11/30), which concentrated in the B2 cluster. K54-Kp primarily carried virulence genes of aerobactin, silS, allS, wcaG, wabG, and mrkD, among which the terW gene was closely related to ST29 (p<0.05). The strains infected by the bloodstream had strong biofilm formation ability (p<0.05). Most strains were sensitive to serum. Still, the virulence of pLVPK-like virulence plasmid in ST29-K54 Klebsiella pneumoniae was lower than that of ST11 type and NTUH-K2044 in the Galleria mellonella model. Therefore, these findings supply a foundation to roundly comprehend K54-Kp, and clinicians should strengthen supervision and attention.
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Affiliation(s)
- Jiehui Qiu
- Department of Infectious Disease, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, China
| | - Dandan Wei
- Departments of Clinical Laboratory, Medical Center of Burn Plastic and Wound Repair, The First Affiliated Hospital of Nanchang University, Nanchang, China
- National Regional Center for Respiratory Medicine, China-Japan Friendship Hospital Jiangxi Hospital, Nanchang, China
| | - Jiaxin Ma
- Department of Infectious Disease, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, China
| | - Ren Liu
- Department of Infectious Disease, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, China
| | - Jianglong Shi
- Department of Infectious Disease, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, China
| | - Qun Ren
- Department of Infectious Disease, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, China
| | - Chunping Wei
- Department of Infectious Disease, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, China
| | - Binghui Huo
- Departments of Clinical Laboratory, Medical Center of Burn Plastic and Wound Repair, The First Affiliated Hospital of Nanchang University, Nanchang, China
| | - Lanlan Zhu
- Department of Pulmonary and Critical Care Medicine, The First Affiliated Hospital of Nanchang University, Nanchang University, Nanchang, China
| | - Tianxin Xiang
- Medical Center for Major Public Health Events in Jiangxi Province, The First Affiliated Hospital of Nanchang University, Nanchang, China
| | - Yang Liu
- Departments of Clinical Laboratory, Medical Center of Burn Plastic and Wound Repair, The First Affiliated Hospital of Nanchang University, Nanchang, China
- National Regional Center for Respiratory Medicine, China-Japan Friendship Hospital Jiangxi Hospital, Nanchang, China
- Jiangxi Medicine Academy of Nutrition and Health Management, The First Affiliated Hospital of Nanchang University, Nanchang, China
| | - Na Cheng
- Medical Center for Major Public Health Events in Jiangxi Province, The First Affiliated Hospital of Nanchang University, Nanchang, China
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Maleki NS, Babazadeh F, Arzanlou M, Teimourpour R, Dogaheh HP. Serotyping and molecular profiles of virulence-associated genes among Klebsiella pneumoniae isolates from teaching hospitals of Ardabil, Iran: A cross-sectional study. Health Sci Rep 2023; 6:e1557. [PMID: 37706015 PMCID: PMC10496611 DOI: 10.1002/hsr2.1557] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2023] [Revised: 08/13/2023] [Accepted: 08/22/2023] [Indexed: 09/15/2023] Open
Abstract
Background and Aims Klebsiella pneumoniae is a Gram-negative bacterium that colonized various organs. This bacterium is associated with different community-acquired and hospital-acquired infections. The present study aims to assess the capsular serotypes and frequency of virulence-associated genes in K. pneumoniae isolates from teaching hospitals in Ardabil, Iran. Methods From October 1, 2019, to November 31, 2021, different clinical samples were collected and K. pneumoniae isolates were diagnosed using conventional biochemical tests. The final identification of K. pneumoniae was performed through the polymerase chain reaction (PCR) method using a specific primer targeting the khe gene. The PCR method was employed to confirm the presence of virulence-associated genes and aerobactin, and the main capsular serotypes based on the specific primers. Results Of all 100 K. pneumoniae isolates, 4% and 2% were typeable with K5 and K2 primers, respectively. In addition, entB (94%), fimH (91%), and wcaG (87%) had the highest frequency among the virulence-associated genes. 24% of K. pneumoniae isolates harbored the entB-wcaG-fimH genes simultaneously. Moreover, 50% of capsular serotype 5 harbored the ybts-mrkD-entB-wcaG-fimH genes simultaneously. Conclusion The findings revealed that 6% of all K. pneumoniae isolates were typeable, distributed in the two serotypes K5 and K2. Most K. pneumoniae isolates were positive for multiple types of virulence genes. Identifying bacterial virulence genes aids in molecular detection, assay development, and therapeutic pathways.
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Affiliation(s)
- Neda Same Maleki
- Department of Microbiology, School of MedicineArdabil University of Medical SciencesArdabilIran
| | - Forough Babazadeh
- Department of Microbiology, School of MedicineArdabil University of Medical SciencesArdabilIran
| | - Mohsen Arzanlou
- Department of Microbiology, School of MedicineArdabil University of Medical SciencesArdabilIran
| | - Roghayeh Teimourpour
- Department of Microbiology, School of MedicineArdabil University of Medical SciencesArdabilIran
| | - Hadi Peeri Dogaheh
- Department of Microbiology, School of MedicineArdabil University of Medical SciencesArdabilIran
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Li HF, Zhang LX, Zhang WL, Li J, Li YQ, Hu TP. Study on Virulence Genes, Drug Resistance and Molecular Epidemiology of Klebsiella pneumoniae with High Virulence in Inner Mongolia, China. Infect Drug Resist 2023; 16:1133-1144. [PMID: 36861017 PMCID: PMC9969862 DOI: 10.2147/idr.s391468] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Accepted: 12/16/2022] [Indexed: 02/25/2023] Open
Abstract
Objective The purpose of this study was to analyse the clinical, microbiological and molecular epidemiological characteristics of patients with pyogenic liver abscess (PLA) caused by Klebsiella pneumoniae (KPN) in Inner Mongolia, China. Methods The KPN isolates from 78 KPN-PLA cases admitted to a tertiary teaching hospital in Baotou, Inner Mongolia, from 2016 to 2019 were studied systematically and described comprehensively. The virulence factors, drug resistance and sequence types of KPN in different samples were identified by a wire-drawing test, polymerase chain reaction, a drug susceptibility test and multi-site sequence typing. Results There were more male than female KPN-PLA patients (P<0.05). The mortality rate was 2.5%, and KPN-PLA was significantly associated with diabetes mellitus (P<0.05). Most of the KPN isolates in the puncture fluid of patients with KPN-PLA were hypervirulent KPN (HvKP). The positive rate of the KPN-PLA specimens was higher than that of the blood and urine specimens. The KPN isolates of the urine specimens had higher drug resistance than the other two (P<0.05). The hypermucoviscous KPN, aerobic actin (aero) (+), K1 and K2 serotypes accounted for 80.8%, 89.7%, 56.4% and 26.9%, respectively. In addition to ironB (3.8%), the detection rates of virulence factors rmpA, irp2, entB, iucD, aero, wcaG, iutA, kfu, ybtA, iron, fimH and mrkD were higher (69.2%-100.0%). The positive rate of KPN isolates of the KPN-PLA puncture fluid was higher than that of the blood and urine samples (P<0.05). In addition, ST23 was found to be the dominant ST (32.1%) of KPN-PLA in the Baotou region. Conclusion In the KPN-PLA specimens, the KPN isolates were more virulent than those in the blood and urine specimens, and a carbapenem-resistant HvKP strain emerged. This research will help improve the understanding of HvKP and provide useful suggestions for KPN-PLA treatments.
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Affiliation(s)
- Hong-Fu Li
- Department of Clinical Laboratory, Zhuhai Third People’s Hospital, Zhuhai, People’s Republic of China,Department of Clinical laboratory, the First Affiliated Hospital of Baotou Medical College, Inner Mongolia University of Science and Technology, Inner Mongolia, People’s Republic of China
| | - Li-Xia Zhang
- Department of Clinical laboratory, the First Affiliated Hospital of Baotou Medical College, Inner Mongolia University of Science and Technology, Inner Mongolia, People’s Republic of China
| | - Wen-Lan Zhang
- Department of Clinical laboratory, the First Affiliated Hospital of Baotou Medical College, Inner Mongolia University of Science and Technology, Inner Mongolia, People’s Republic of China
| | - Jing Li
- Department of Clinical laboratory, the First Affiliated Hospital of Baotou Medical College, Inner Mongolia University of Science and Technology, Inner Mongolia, People’s Republic of China
| | - Ya-Qian Li
- Department of Clinical laboratory, the First Affiliated Hospital of Baotou Medical College, Inner Mongolia University of Science and Technology, Inner Mongolia, People’s Republic of China
| | - Tong-Ping Hu
- Department of Clinical laboratory, the First Affiliated Hospital of Baotou Medical College, Inner Mongolia University of Science and Technology, Inner Mongolia, People’s Republic of China,Correspondence: Tong-Ping Hu, Department of Clinical laboratory, the First Affiliated Hospital of Baotou Medical College, Inner Mongolia University of Science and Technology, No. 41, of Linyin Road, Kundulun District, Baotou City, Baotou, 014000, People’s Republic of China, Tel +86 13296922365, Email
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Plainvert C, de Saint Salvy-Tabet Y, Dmytruk N, Frigo A, Poyart C, Tazi A. Group B Streptococcus invasive infections in women of childbearing age, France, 2012 - 2020 : GBS CC-17 hypervirulence in intrapartum infections. J Infect Dis 2022; 226:541-545. [PMID: 35235664 DOI: 10.1093/infdis/jiac076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Accepted: 03/01/2022] [Indexed: 11/13/2022] Open
Abstract
Group B Streptococcus (GBS) is the leading cause of neonatal infections and an important pathogen in pregnancy. However, the features of pregnancy-associated infections are poorly reported. We analyzed 336 cases of GBS invasive infections in women aged 18 to 50 years old, including 242 (72.0%) pregnancy-associated infections. In pregnancy, most cases were intra-amniotic infections (55.8%), occurred preterm (61.3%) and were associated to obstetrical and neonatal complications (81.7%). The GBS clone CC-17 (18.8% of the cases) was overrepresented intrapartum (35.2%; OR = 5.1, 95% CI 1.6-19.3). This work highlights the burden of GBS and of the CC-17 clone infections during pregnancy.
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Affiliation(s)
- Céline Plainvert
- Department of Bacteriology, University Hospitals Paris Centre-Cochin, French National Reference Center for Streptococci, FHU Prematurity, Paris, 75014, France.,Assistance Publique - Hôpitaux de Paris, Cochin Hospital, Paris, 75014, France.,Cochin Institute, INSERM U1016, UMR CNRS 8104, Team Bacteria and Perinatality, Paris, 74014, France
| | - Yasmina de Saint Salvy-Tabet
- Department of Bacteriology, University Hospitals Paris Centre-Cochin, French National Reference Center for Streptococci, FHU Prematurity, Paris, 75014, France
| | - Nicolas Dmytruk
- Department of Bacteriology, University Hospitals Paris Centre-Cochin, French National Reference Center for Streptococci, FHU Prematurity, Paris, 75014, France.,Assistance Publique - Hôpitaux de Paris, Cochin Hospital, Paris, 75014, France
| | - Amandine Frigo
- Department of Bacteriology, University Hospitals Paris Centre-Cochin, French National Reference Center for Streptococci, FHU Prematurity, Paris, 75014, France.,Assistance Publique - Hôpitaux de Paris, Cochin Hospital, Paris, 75014, France
| | - Claire Poyart
- Department of Bacteriology, University Hospitals Paris Centre-Cochin, French National Reference Center for Streptococci, FHU Prematurity, Paris, 75014, France.,Assistance Publique - Hôpitaux de Paris, Cochin Hospital, Paris, 75014, France.,Cochin Institute, INSERM U1016, UMR CNRS 8104, Team Bacteria and Perinatality, Paris, 74014, France.,University of Paris, France
| | - Asmaa Tazi
- Department of Bacteriology, University Hospitals Paris Centre-Cochin, French National Reference Center for Streptococci, FHU Prematurity, Paris, 75014, France.,Assistance Publique - Hôpitaux de Paris, Cochin Hospital, Paris, 75014, France.,Cochin Institute, INSERM U1016, UMR CNRS 8104, Team Bacteria and Perinatality, Paris, 74014, France.,University of Paris, France
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Khan UB, Jauneikaite E, Andrews R, Chalker VJ, Spiller OB. Identifying large-scale recombination and capsular switching events in Streptococcus agalactiae strains causing disease in adults in the UK between 2014 and 2015. Microb Genom 2022; 8:000783. [PMID: 35290175 PMCID: PMC9176283 DOI: 10.1099/mgen.0.000783] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Cases of invasive group B streptococcal infection in the adult UK population have steadily increased over recent years, with the most common serotypes being V, III and Ia, but less is known of the genetic background of these strains. We have carried out in-depth analysis of the whole-genome sequences of 193 clinically important group B Streptococcus (GBS) isolates (184 were from invasive infection, 8 were from non-invasive infection and 1 had no information on isolation site) isolated from adults and submitted to the National Reference Laboratory at the UK Health Security Agency between January 2014 and December 2015. We have determined that capsular serotypes III (26.9%), Ia (26.4%) and V (15.0%) were most commonly identified, with slight differences in gender and age distribution. Most isolates (n=182) grouped to five clonal complexes (CCs), CC1, CC8/CC10, CC17, CC19 and CC23, with common associations between specific serotypes and virulence genes. Additionally, we have identified large recombination events mediating potential capsular switching events between sequence type (ST)1 serotype V and serotypes Ib (n=2 isolates), II (n=2 isolates) and VI (n=2 isolates); between ST19 serotype III and serotype V (n=5 isolates); and between CC17 serotype III and serotype IV (n=1 isolate). The high genetic diversity of disease-causing isolates and multiple recombination events reported in this study highlight the need for routine surveillance of the circulating disease-causing GBS strains. This information is crucial to better understand the global spread of GBS serotypes and genotypes, and will form the baseline information for any future GBS vaccine research in the UK and worldwide.
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Affiliation(s)
- Uzma Basit Khan
- Division of Infection and Immunity, School of Medicine, Cardiff University, Cardiff, UK
- Present address: Parasites and Microbes, Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton CB10 1SA, UK
| | - Elita Jauneikaite
- Department of Infectious Disease Epidemiology, School of Public Health, Imperial College London, London, UK
- NIHR Health Protection Research Unit in Healthcare Associated Infections and Antimicrobial Resistance, Department of Infectious Disease, Faculty of Medicine, Imperial College London, London, UK
- *Correspondence: Elita Jauneikaite,
| | - Robert Andrews
- Systems Immunity University Research Institute, Division of Infection and Immunity, School of Medicine, Cardiff University, Cardiff, UK
| | - Victoria J. Chalker
- National Infection Service, United Kingdom Health Security Agency, Colindale, London, UK
| | - Owen B. Spiller
- Division of Infection and Immunity, School of Medicine, Cardiff University, Cardiff, UK
- National Infection Service, United Kingdom Health Security Agency, Colindale, London, UK
- *Correspondence: Owen B. Spiller,
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Yang Y, Liu JH, Hu XX, Zhang W, Nie TY, Yang XY, Wang XK, Li CR, You XF. Clinical and microbiological characteristics of hypervirulent Klebsiella pneumoniae (hvKp) in a hospital from North China. J Infect Dev Ctries 2020; 14:606-613. [PMID: 32683351 DOI: 10.3855/jidc.12288] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2019] [Accepted: 04/08/2020] [Indexed: 10/31/2022] Open
Abstract
INTRODUCTION The clinical and molecular characteristics of hypervirulent Klebsiella pneumoniae (hvKp) in various provinces of China have been reported, however, there have been few reports in Hebei Province, North China. METHODOLOGY The hvKp was identified by PCR amplification of hypervirulence-related genes, the hypermucoviscous phenotype was determined by the "string test", the drug susceptibility analysis was performed using the VITEK® 2 Compact Bacterial Identification and Monitoring System. Logistic regression was used to identify risk factors for hvKp infection. The molecular epidemiological characteristics of the strains were analyzed by pulsed-field gel electrophoresis (PFGE), and the capsular serotype of hvKp strain was detected by PCR. RESULTS Overall, 52.21% (59/113) of K. pneumoniae isolates were hvKp, and the ratios of patients with older ages or a higher PMN cell count among hvKp infection were higher than those among classical Klebsiella pneumoniae (cKp) infection. hvKp are more susceptible to antibacterial drugs than cKp, and one ESBLs-producing hvKp strain was detected. The main capsular serotype of hvKp were K2, K57 and K1. PFGE indicated that the 59 strains of hvKp could be classified into 51 PFGE band types, forming 6 PFGE clusters. CONCLUSIONS In this study, the detection rate of hvKp was 52.21% (59/113) identified by virulence genes. People with older ages or a higher PMN cell count are more likely to gain hvKp infection. ESBLs-producing hvKp is emerging, indicating the importance of epidemiologic surveillance and clinical awareness of this pathogen in this region.
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Affiliation(s)
- Yan Yang
- Beijing Key Laboratory of Antimicrobial Agents, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.
| | - Jian-Hua Liu
- Department of Respiratory Medicine, The First Affiliated Hospital of Hebei North University, Zhangjiakou, China.
| | - Xin-Xin Hu
- Beijing Key Laboratory of Antimicrobial Agents, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.
| | - Wei Zhang
- Clinical Microbiology Laboratory, The First Affiliated Hospital of Hebei North University, Zhangjiakou, China.
| | - Tong-Ying Nie
- Beijing Key Laboratory of Antimicrobial Agents, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.
| | - Xin-Yi Yang
- Beijing Key Laboratory of Antimicrobial Agents, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.
| | - Xiu-Kun Wang
- Beijing Key Laboratory of Antimicrobial Agents, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.
| | - Cong-Ran Li
- Beijing Key Laboratory of Antimicrobial Agents, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.
| | - Xue-Fu You
- Beijing Key Laboratory of Antimicrobial Agents, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.
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Hasani A, Soltani E, Ahangarzadeh Rezaee M, Pirzadeh T, Ahangar Oskouee M, Hasani A, Gholizadeh P, Noie Oskouie A, Binesh E. Serotyping of Klebsiella pneumoniae and Its Relation with Capsule-Associated Virulence Genes, Antimicrobial Resistance Pattern, and Clinical Infections: A Descriptive Study in Medical Practice. Infect Drug Resist 2020; 13:1971-1980. [PMID: 32606843 PMCID: PMC7321687 DOI: 10.2147/idr.s243984] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2019] [Accepted: 06/11/2020] [Indexed: 11/23/2022] Open
Abstract
Objective Klebsiella pneumoniae, one of the clinical superbugs, causes diverse infections because of its variable capsular antigens. This study focused on K. pneumoniae and aimed to assess any correlation between capsular serotype, capsule-associated virulence genes, and evaluate its resistance to conventional antibiotics in order to gain insight into any regional differences. Materials and Methods A total of 61 K. pneumoniae collected from various clinical specimens were confirmed genotypically. Clinical and demographic data for all patients were reviewed. All isolates were subjected to antimicrobial susceptibility tests. Capsular serotyping and capsule-associated virulence genes were studied using the molecular method. Results All typeable isolates were typed into K5, K20, and K54 serotypes, and among them, K54 was observed to be predominant. The most common capsule-associated virulence genes comprised uge (93.4%), ycfM (91.8%), and wabG (88.5%), while wcaG (29.5%) and rmpA (21.3%) were noted at much lower prevalence rates. The gene wcaG was significantly associated with K54 positive isolates (p = 0.001), while rmpA was associated with K20 positive isolates (p = 0.01). Conclusion Serotype K54 had a high frequency in isolates collected from patients with pulmonary diseases, while serotype K20 was associated with burn patients. Carbapenems and levofloxacin were the best therapeutic options for the treatment of infections with serotypes K20 and K54.
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Affiliation(s)
- Alka Hasani
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.,Department of Bacteriology and Virology, Faculty of Medicine, Tabriz University of Medical, Sciences, Tabriz, Iran.,Sina Hospital, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Elghar Soltani
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.,Department of Bacteriology and Virology, Faculty of Medicine, Tabriz University of Medical, Sciences, Tabriz, Iran
| | - Mohammad Ahangarzadeh Rezaee
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.,Department of Bacteriology and Virology, Faculty of Medicine, Tabriz University of Medical, Sciences, Tabriz, Iran
| | - Tahereh Pirzadeh
- Department of Bacteriology and Virology, Faculty of Medicine, Tabriz University of Medical, Sciences, Tabriz, Iran
| | - Mahin Ahangar Oskouee
- Department of Bacteriology and Virology, Faculty of Medicine, Tabriz University of Medical, Sciences, Tabriz, Iran
| | - Akbar Hasani
- Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Pourya Gholizadeh
- Department of Bacteriology and Virology, Faculty of Medicine, Tabriz University of Medical, Sciences, Tabriz, Iran
| | - Arezoo Noie Oskouie
- Department of Bacteriology and Virology, Faculty of Medicine, Tabriz University of Medical, Sciences, Tabriz, Iran
| | - Ehsan Binesh
- Department of Infectious Disease, School of Medicine, Shahroud University of Medical Science, Shahroud, Iran
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8
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Pimenta F, Gertz RE, Park SH, Kim E, Moura I, Milucky J, Rouphael N, Farley MM, Harrison LH, Bennett NM, Bigogo G, Feikin DR, Breiman R, Lessa FC, Whitney CG, Rajam G, Schiffer J, da Gloria Carvalho M, Beall B. Streptococcus infantis, Streptococcus mitis, and Streptococcus oralis Strains With Highly Similar cps5 Loci and Antigenic Relatedness to Serotype 5 Pneumococci. Front Microbiol 2019; 9:3199. [PMID: 30671034 PMCID: PMC6332807 DOI: 10.3389/fmicb.2018.03199] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Accepted: 12/10/2018] [Indexed: 11/13/2022] Open
Abstract
Streptococcus pneumoniae is a highly impactful bacterial pathogen on a global scale. The principal pneumococcal virulence factor and target of effective vaccines is its polysaccharide capsule, of which there are many structurally distinct forms. Here, we describe four distinct strains of three Mitis group commensal species (Streptococcus infantis, Streptococcus mitis, and Streptococcus oralis) recovered from upper respiratory tract specimens from adults in Kenya and the United States that were PCR-positive for the pneumococcal serotype 5 specific gene, wzy5. For each of the four strains, the 15 genes comprising the capsular polysaccharide biosynthetic gene cluster (cps5) shared the same order found in serotype 5 pneumococci, and each of the serotype 5-specific genes from the serotype 5 pneumococcal reference strain shared 76-99% sequence identity with the non-pneumococcal counterparts. Double-diffusion experiments demonstrated specific reactivity of the non-pneumococcal strains with pneumococcal serotype 5 typing sera. Antiserum raised against S. mitis strain KE67013 specifically reacted with serotype 5 pneumococci for a positive Quellung reaction and stimulated serotype 5 specific opsonophagocytic killing of pneumococci. Four additional commensal strains, identified using PCR serotyping assays on pharyngeal specimens, revealed loci highly homologous to those of pneumococci of serotypes 12F, 15A, 18C, and 33F. These data, in particular the species and strain diversity shown for serotype 5, highlight the existence of a broad non-pneumococcal species reservoir in the upper respiratory tract for the expression of capsular polysaccharides that are structurally related or identical to those corresponding to epidemiologically significant serotypes. Very little is known about the genetic and antigenic capsular diversity among the vast array of commensal streptococcal strains that represent multiple diverse species. The discovery of serotype 5 strains within three different commensal species suggests that extensive capsular serologic overlap exists between pneumococci and other members of the diverse Mitis group. These findings may have implications for our current understanding of naturally acquired immunity to S. pneumoniae and pneumococcal serotype distributions in different global regions. Further characterization of commensal strains carrying homologs of serotype-specific genes previously thought to be specific for pneumococci of known serotypes may shed light on the evolution of these important loci.
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Affiliation(s)
- Fabiana Pimenta
- Division of Bacterial Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA, United States
| | - Robert E Gertz
- Division of Bacterial Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA, United States
| | - So Hee Park
- Division of Bacterial Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA, United States
| | - Ellie Kim
- Division of Bacterial Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA, United States
| | - Iaci Moura
- Division of Bacterial Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA, United States
| | - Jennifer Milucky
- Division of Bacterial Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA, United States
| | - Nadine Rouphael
- Department of Medicine, Emory University School of Medicine, Atlanta, GA, United States
| | - Monica M Farley
- Department of Medicine, Emory University School of Medicine, Atlanta, GA, United States.,Atlanta Veterans Affairs Medical Center, Atlanta GA, United States
| | - Lee H Harrison
- Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, United States
| | - Nancy M Bennett
- Department of Medicine, University of Rochester School of Medicine and Dentistry, Rochester, NY, United States
| | - Godfrey Bigogo
- Kenya Medical Research Institute, Nairobi, Kenya.,International Emerging Infections Program, Centers for Disease Control and Prevention, Nairobi, Kenya
| | - Daniel R Feikin
- Kenya Medical Research Institute, Nairobi, Kenya.,International Emerging Infections Program, Centers for Disease Control and Prevention, Nairobi, Kenya
| | - Robert Breiman
- Kenya Medical Research Institute, Nairobi, Kenya.,International Emerging Infections Program, Centers for Disease Control and Prevention, Nairobi, Kenya
| | - Fernanda C Lessa
- Division of Bacterial Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA, United States
| | - Cynthia G Whitney
- Division of Bacterial Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA, United States
| | - Gowrisankar Rajam
- Division of Bacterial Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA, United States
| | - Jarad Schiffer
- Division of Bacterial Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA, United States
| | - Maria da Gloria Carvalho
- Division of Bacterial Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA, United States
| | - Bernard Beall
- Division of Bacterial Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA, United States
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Toyofuku M, Morozumi M, Hida M, Satoh Y, Sakata H, Shiro H, Ubukata K, Murata M, Iwata S. Effects of Intrapartum Antibiotic Prophylaxis on Neonatal Acquisition of Group B Streptococci. J Pediatr 2017; 190:169-173.e1. [PMID: 29144242 DOI: 10.1016/j.jpeds.2017.07.039] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/22/2017] [Revised: 06/22/2017] [Accepted: 07/19/2017] [Indexed: 11/24/2022]
Abstract
OBJECTIVES To assess the incidence of colonization with group B streptococci (GBS) among neonates as influenced by maternal GBS carriage and intrapartum antibiotic prophylaxis (IAP). STUDY DESIGN Between October 2014 and May 2015, nasopharyngeal and rectal swab samples were collected from 730 neonates at 1 week and 1 month after birth. GBS and capsular serotype were identified by real-time polymerase chain reaction and by culture. IAP at delivery was determined retrospectively from hospital records. RESULTS Sixty-four neonates (8.8%) were GBS-positive by real-time polymerase chain reaction and culture. Among neonates born to mothers who were GBS carriers (n = 107), 94.4% (101/107) had maternal IAP; 19.6% nonetheless were GBS-positive, compared with 6.5% of neonates born to noncarrier mothers (P <.01). Among neonates born to mothers receiving IAP, more were positive only at 1 month of age than at both 1 week and 1 month. The frequency of GBS in neonates born to mothers receiving IAP was significantly lower than that in neonates born to mothers not receiving IAP (P <.05). Capsular serotypes V (25%) and III (23.4%) were common, followed by Ib (15.6%), Ia (14.1%), II (7.8%), IV (6.3%), nontypeable (4.7%), and VI and VIII (each 1.6%). CONCLUSIONS Delayed colonization with GBS occurs in infants born to GBS carrier mothers receiving IAP. GBS should be considered in all infants at 1 month after birth with signs of infection.
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Affiliation(s)
- Meiwa Toyofuku
- Division of Pediatrics, Yokohama Rosai Hospital, Yokohama, Japan; Department of Infectious Diseases, Keio University School of Medicine, Tokyo, Japan
| | - Miyuki Morozumi
- Department of Infectious Diseases, Keio University School of Medicine, Tokyo, Japan
| | - Mariko Hida
- Division of Pediatrics, Yokohama Rosai Hospital, Yokohama, Japan
| | | | - Hiroshi Sakata
- Division of Pediatrics, Asahikawa Kosei Hospital, Asahikawa, Japan
| | - Hiroyuki Shiro
- Division of Pediatrics, Yokohama Rosai Hospital, Yokohama, Japan
| | - Kimiko Ubukata
- Department of Infectious Diseases, Keio University School of Medicine, Tokyo, Japan
| | - Mitsuru Murata
- Department of Laboratory Medicine, Keio University School of Medicine, Tokyo, Japan
| | - Satoshi Iwata
- Department of Infectious Diseases, Keio University School of Medicine, Tokyo, Japan
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