scholarly journals Molecular epidemiological typing within the European Gonococcal Antimicrobial Resistance Surveillance Programme reveals predominance of a multidrug-resistant clone

2013 ◽  
Vol 18 (3) ◽  
Author(s):  
S A Chisholm ◽  
M Unemo ◽  
N Quaye ◽  
E Johansson ◽  
M J Cole ◽  
...  
Keyword(s):  
Antimicrobial Resistance ◽  
Multidrug Resistant ◽  
Resistant Clone ◽  
Epidemiological Typing ◽  
Surveillance Programme ◽  
Antimicrobial Surveillance ◽  
Ciprofloxacin Resistance ◽  
Susceptibility And Resistance ◽  
Third Generation Cephalosporins ◽  
Sequence Types

Treatment of gonorrhoea is threatened by antimicrobial resistance, and decreased susceptibility and resistance to recommended therapies is emerging in Europe. Current associations between resistance and molecular type remain poorly understood. Gonococcal isolates (n=1,066) collected for the 2009 and 2010 European Gonococcal Antimicrobial Surveillance Programme were typed by Neisseria gonorrhoeae multi-antigen sequence typing (NG-MAST). A total of 406 sequence types (STs) were identified, 125 of which occurred in ≥two isolates. Seven major genogroups of closely related STs (varying by ≤1% at just one of the two target loci) were defined. Genogroup 1407 (G1407), observed in 20/21 countries and predominant in 13/21 countries, accounted for 23% of all isolates and was associated with decreased susceptibility to cefixime and resistance to ciprofloxacin and raised minimum inhibitory concentrations for ceftriaxone and azithromycin. Genogroup 225 (G225), associated with ciprofloxacin resistance, was observed in 10% of isolates from 19/21 countries. None of the other genogroups were associated with antimicrobial resistance. The predominance of a multidrug-resistant clone (G1407) in Europe is worrying given the recent reports of recommended third generation cephalosporins failing to treat infections with this clone. Identifying associations between ST and antimicrobial resistance aids the understanding of the dissemination of resistant clones within a population and could facilitate development of targeted intervention strategies.

scholarly journals Distribution and Antimicrobial Resistance of Salmonella Isolated from Pigs with Diarrhea in China

2018 ◽  
Vol 6 (4) ◽  
pp. 117 ◽  
Author(s):  
Jin-Hui Su ◽  
Yao-Hong Zhu ◽  
Tian-Yi Ren ◽  
Liang Guo ◽  
Gui-Yan Yang ◽  
...  
Keyword(s):  
Antimicrobial Resistance ◽  
Metal Tolerance ◽  
Heavy Metal Tolerance ◽  
Clonal Expansion ◽  
Multidrug Resistant ◽  
High Similarity ◽  
Enteric Diseases ◽  
Antimicrobial Resistance Genes ◽  
Wide Range ◽  
Sequence Types

Salmonella can cause enteric diseases in humans and a wide range of animals, and even outbreaks of foodborne illness. The aim of this study was to investigate the frequency and distribution of serovars, and antimicrobial resistance in Salmonella isolates from pigs with diarrhea in 26 provinces in China from 2014 to 2016. A total of 104 Salmonella isolates were identified and the dominant serovar was S. 4,[5],12:i:- (53.9%). All Salmonella isolates were resistant to trimethoprim-sulfamethoxazole, and many were resistant to ampicillin (80.8%) and tetracycline (76.9%). Among 104 Salmonella isolates, aac(6′)-Ib-cr was the dominant plasmid-mediated quinolone resistance gene (80.8%), followed by qnrS (47.1%). The pulsed-field gel electrophoresis results suggest that the Salmonella isolates from different regions were genetically diverse, and ST34 was the most prevalent. S. 4,[5],12:i:- isolates is the widespread presence of heavy metal tolerance genes. The fact that the same sequence types were found in different regions and the high similarity coefficient of S. 4,[5],12:i:- isolates from different regions indicate the clonal expansion of the isolates, and the isolates carried various antimicrobial resistance genes. The multidrug resistant Salmonella can be widely detected in pigs, which will present a challenge for farm husbandry.

scholarly journals Occurrence of Pseudomonas spp. in Raw Vegetables: Molecular and Phenotypical Analysis of Their Antimicrobial Resistance and Virulence-Related Traits

2021 ◽  
Vol 22 (23) ◽  
pp. 12626
Author(s):  
Lidia Ruiz-Roldán ◽  
Beatriz Rojo-Bezares ◽  
Carmen Lozano ◽  
María López ◽  
Gabriela Chichón ◽  
...  
Keyword(s):  
Antimicrobial Resistance ◽  
Insertion Sequence ◽  
Multidrug Resistant ◽  
Pulsed Field Gel Electrophoresis ◽  
Plant Diseases ◽  
Resistant Isolate ◽  
Ecological Niches ◽  
Great Capacity ◽  
Pseudomonas Spp ◽  
Sequence Types

Pseudomonas is characterized by its great capacity to colonize different ecological niches, but also by its antimicrobial resistance and pathogenicity, causing human, animal, or plant diseases. Raw and undercooked food is a potential carrier of foodborne disease. The aim of this study was to determine the occurrence of Pseudomonas spp. among raw vegetables, analysing their antimicrobial resistance, virulence, and molecular typing. A total of 163 Pseudomonas spp. isolates (12 different species) were recovered from 77 of the 145 analysed samples (53.1%) and were classified into 139 different pulsed-field gel electrophoresis patterns. Low antimicrobial resistance levels, but one multidrug-resistant isolate, were found. Among the 37 recovered P. aeruginosa strains, 28 sequence-types and nine serotypes were detected. Eleven OprD patterns and an insertion sequence (ISPa1635) truncating the oprD gene of one imipenem-resistant strain were found. Ten virulotypes were observed, including four exoU-positive and thirty-one exoS-positive strains. The lasR gene was absent in three ST155 strains and was truncated by different insertion sequences (ISPre2, IS1411, and ISPst7) in other three strains. High biofilm, motility, pigment, elastase, and rhamnolipid production were detected. Our study demonstrated a low occurrence of P. aeruginosa (18%) and low antimicrobial resistance, but a high number of virulence-related traits in these P. aeruginosa strains, highlighting their pathological importance.

scholarly journals Molecular Characterization of Cephalosporin and Fluoroquinolone Resistant Salmonella choleraesuis Isolated from Patients with Systemic Salmonellosis in Thailand

Antibiotics ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 844
Author(s):  
Pichapak Sriyapai ◽  
Chaiwat Pulsrikarn ◽  
Kosum Chansiri ◽  
Arin Nyamniyom ◽  
Thayat Sriyapai
Keyword(s):  
Antimicrobial Resistance ◽  
Public Health Problem ◽  
Multidrug Resistant ◽  
Pulse Field ◽  
Diffusion Method ◽  
Third Generation ◽  
Disk Diffusion Method ◽  
Salmonella Choleraesuis ◽  
Antimicrobial Resistance Genes ◽  
Third Generation Cephalosporins

The antimicrobial resistance of nontyphoidal Salmonella has become a major clinical and public health problem. Southeast Asia has a high level of multidrug-resistant Salmonella and isolates resistant to both fluoroquinolone and third-generation cephalosporins. The incidence of co-resistance to both drug classes is a serious therapeutic problem in Thailand. The aim of this study was to determine the antimicrobial resistance patterns, antimicrobial resistance genes and genotypic relatedness of third-generation cephalosporins and/or fluoroquinolone-resistant Salmonella Choleraesuis isolated from patients with systemic salmonellosis in Thailand. Antimicrobial susceptibility testing was performed using the agar disk diffusion method, and ESBL production was detected by the combination disc method. A molecular evaluation of S. Choleraesuis isolates was performed using PCR and DNA sequencing. Then, a genotypic relatedness study of S. Choleraesuis was performed by pulse field gel electrophoresis. All 62 cefotaxime-resistant S. Choleraesuis isolates obtained from 61 clinical specimens were multidrug resistant. Forty-four isolates (44/62, 71.0%) were positive for ESBL phenotypes. Based on the PCR sequencing, 21, 1, 13, 23, 20 and 6 ESBL-producing isolates harboured the ESBL genes blaCTX-M-14, blaCTX-M-15, blaCTX-M-55, blaCMY-2, blaACC-1 and blaTEM-1, respectively. This study also found that nine (9/62, 14.5%) isolates exhibited co-resistance to ciprofloxacin and cefotaxime. All of the co-resistant isolates harboured at least one PMQR gene. The qnr genes and the aac(6′)-Ib-cr gene were the most prevalent genes detected. The QRDR mutation, including the gyrA (D87Y and D87G) and parC (T57S) genes, was also detected. PFGE patterns revealed a high degree of clonal diversity among the ESBL-producing isolates.

scholarly journals Antimicrobial Resistance and Genomic Characterization of Six New Sequence Types in Multidrug-Resistant Pseudomonas aeruginosa Clinical Isolates from Pakistan

Antibiotics ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 1386
Author(s):  
Sidra Irum ◽  
Kanwal Naz ◽  
Nimat Ullah ◽  
Zeeshan Mustafa ◽  
Amjad Ali ◽  
...  
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Antimicrobial Resistance ◽  
Tertiary Care ◽  
Bacterial Pathogen ◽  
Housekeeping Genes ◽  
Multidrug Resistant ◽  
Close Monitoring ◽  
Care Hospital ◽  
Healthcare Facilities ◽  
Sequence Types

Pseudomonas aeruginosa (P. aeruginosa) is a major bacterial pathogen associated with a variety of infections with high mortality rates. Most of the clinical P. aeruginosa isolates belong to a limited number of genetic subgroups characterized by multiple housekeeping genes’ sequences (usually 5–7) through the Multi-Locus Sequence Typing (MLST) scheme. The emergence and dissemination of novel multidrug-resistant (MDR) sequence types (ST) in P. aeruginosa pose serious clinical concerns. We performed whole-genome sequencing on a cohort (n = 160) of MDR P. aeruginosa isolates collected from a tertiary care hospital lab in Pakistan and found six isolates belonging to six unique MLST allelic profiles. The genomes were submitted to the PubMLST database and new ST numbers (ST3493, ST3494, ST3472, ST3489, ST3491, and ST3492) were assigned to the respective allele combinations. MLST and core-genome-based phylogenetic analysis confirmed the divergence of these isolates and positioned them in separate branches. Analysis of the resistome of the new STs isolates revealed the presence of genes blaOXA-50, blaPAO, blaPDC, blaVIM-2, aph(3′)-IIb, aac(6′)-II, aac(3)-Id, fosA, catB7, dfrB2, crpP, merP and a number of missense and frame-shift mutations in chromosomal genes conferring resistance to various antipseudomonal antibiotics. The exoS, exoT, pvdE, rhlI, rhlR, lasA, lasB, lasI, and lasR genes were the most prevalent virulence-related genes among the new ST isolates. The different genotypic features revealed the adaptation of these new clones to a variety of infections by various mutations in genes affecting antimicrobial resistance, quorum sensing and biofilm formation. Close monitoring of these antibiotic-resistant pathogens and surveillance mechanisms needs to be adopted to reduce their spread to the healthcare facilities of Pakistan. We believe that these strains can be used as reference strains for future comparative analysis of isolates belonging to the same STs.

scholarly journals Emerging cephalosporin and multidrug-resistant gonorrhoea in Europe

2014 ◽  
Vol 19 (45) ◽  
Author(s):  
M J Cole ◽  
G Spiteri ◽  
S A Chisholm ◽  
S Hoffmann ◽  
C A Ison ◽  
...  
Keyword(s):  
Multidrug Resistant ◽  
European Economic Area ◽  
The European Union ◽  
Surveillance Programme ◽  
The Public ◽  
First Line Therapy ◽  
Antimicrobial Surveillance ◽  
Health Need ◽  
High Level

Neisseria gonorrhoeae has consistently developed resistance to antimicrobials used therapeutically for gonorrhoea and few antimicrobials remain for effective empiric first-line therapy. Since 2009 the European gonococcal antimicrobial surveillance programme (Euro-GASP) has been running as a sentinel surveillance system across Member States of the European Union (EU) and European Economic Area (EEA) to monitor antimicrobial susceptibility in N. gonorrhoeae. During 2011, N. gonorrhoeae isolates were collected from 21 participating countries, and 7.6% and 0.5% of the examined gonococcal isolates had in vitro resistance to cefixime and ceftriaxone, respectively. The rate of ciprofloxacin and azithromycin resistance was 48.7% and 5.3%, respectively. Two (0.1%) isolates displayed high-level resistance to azithromycin, i.e. a minimum inhibitory concentration (MIC) ≥256 mg/L. The current report further highlights the public health need to implement the European response plan, including further strengthening of Euro-GASP, to control and manage the threat of multidrug resistant N. gonorrhoeae.

scholarly journals Molecular and Clinical Characterization of Multidrug-Resistant and Hypervirulent Klebsiella pneumoniae Strains from Liver Abscess in Taiwan

2020 ◽  
Vol 64 (5) ◽  
Author(s):  
Yi-Tsung Lin ◽  
Yi-Hsiang Cheng ◽  
Chien Chuang ◽  
Sheng-Hua Chou ◽  
Wan-Hsin Liu ◽  
...  
Keyword(s):  
Antimicrobial Resistance ◽  
Klebsiella Pneumoniae ◽  
Liver Abscess ◽  
Multidrug Resistant ◽  
Resistance Mechanisms ◽  
Virulence Plasmid ◽  
Content Type ◽  
Sequence Types

ABSTRACT Hypervirulent Klebsiella pneumoniae strains are the major cause of liver abscesses throughout East Asia, and these strains are usually antibiotic susceptible. Recently, multidrug-resistant and hypervirulent (MDR-HV) K. pneumoniae strains have emerged due to hypervirulent strains acquiring antimicrobial resistance determinants or the transfer of a virulence plasmid into a classic MDR strain. In this study, we characterized the clinical and microbiological properties of K. pneumoniae liver abscess (KPLA) caused by MDR-HV strains in Taiwan. Patients with community onset KPLA were retrospectively identified at Taipei Veterans General Hospital during January 2013 to May 2018. Antimicrobial resistance mechanisms, capsular types, and sequence types were determined. MDR-HV strains and their parental antimicrobial-susceptible strains further underwent whole-genome sequencing (WGS) and in vivo mice lethality tests. Thirteen MDR-HV strains were identified from a total of 218 KPLA episodes. MDR-HV strains resulted in similar outcomes to antimicrobial-susceptible strains. All MDR-HV strains were traditional hypervirulent clones carrying virulence capsular types. The major resistance mechanisms were the overexpression of efflux pumps and/or the acquisition of ESBL or AmpC β-lactamase genes. WGS revealed that two hypervirulent strains had evolved to an MDR phenotype due to mutation in the ramR gene and the acquisition of an SHV-12-bearing plasmid, respectively. Both these MDR-HV strains retained high virulence compared to their parental strains. The spread of MDR-HV K. pneumoniae strains in the community raises significant public concerns, and measures should be taken to prevent the further acquisition of carbapenemase and other resistance genes among these strains in order to avoid the occurrence of untreatable KPLA.

scholarly journals Fluoroquinolone-Resistant Pneumococci: Dynamics of Serotypes and Clones in Spain in 2012 Compared with Those from 2002 and 2006

2014 ◽  
Vol 58 (4) ◽  
pp. 2393-2399 ◽  
Author(s):  
Arnau Domenech ◽  
Jose M. Tirado-Vélez ◽  
Asunción Fenoll ◽  
Carmen Ardanuy ◽  
Jose Yuste ◽  
...  
Keyword(s):  
Multidrug Resistance ◽  
Conjugate Vaccine ◽  
Multidrug Resistant ◽  
Resistant Clone ◽  
Low Level ◽  
Ciprofloxacin Resistance ◽  
High Level

ABSTRACTIn Spain, rates of ciprofloxacin resistance in pneumococci were low during the last decade (2.6% in 2002 and 2.3% in 2006). In 2012, the rate remained at 2.3%, equivalent to 83 of 3,621 isolates. Of the 83 resistant isolates, 15 showed a low level (MIC of 4 to 8 μg/ml) and 68 a high level (MIC of 16 to 128 μg/ml) of ciprofloxacin resistance. Thirteen low-level-resistant isolates had single changes in ParC, one had a single ParE change, and one did not present any mutations. High-level-resistant isolates had GyrA changes plus additional ParC and/or ParE changes: 51, 15, and 2 isolates had 2, 3, or 4 mutations, respectively. Although 24 different serotypes were observed, 6 serotypes accounted for 51.8% of ciprofloxacin-resistant isolates: 8 (14.5%), 19A (10.8%), 11A (7.2%), 23A (7.2%), 15A (6.0%), and 6B (6.0%). A decrease in pneumococcal 7-valent conjugate vaccine (PCV7) serotypes was observed from 2006 (35.7%) to 2012 (16.9%), especially of serotype 14 (from 16.3% to 2.4%;P< 0.001). In comparison with findings in 2006, multidrug resistance was greater in 2012 (P= 0.296), mainly due to the increased presence and/or emergence of clonal complexes associated with non-PCV7 serotypes: CC63 expressing serotypes 8, 15A, and 19A; CC320 (with serotype 19A); and CC42 (with serotype 23A). Although rates of ciprofloxacin resistance remained low and stable throughout the last decade, changes in serotype and genotype distributions were observed in 2012, notably the expansion of a preexisting multidrug-resistant clone, CC63, and the emergence of the CC156 clone expressing serotype 11A.

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