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https://www.readbyqxmd.com/read/30221899/colistin-resistance-due-to-insertional-inactivation-of-the-mgrb-in-klebsiella-pneumoniae-of-clinical-origin-first-report-from-india
#1
A Kumar, L Biswas, N Omgy, K Mohan, V Vinod, A Sajeev, P Nair, S Singh, R Biswas
OBJECTIVE: Mutations in mgrB, phoP/phoQ, pmrA, pmrB, pmrC, and crrABC regulatory systems have been found responsible for colistin resistance. The aim of our study was to investigate the role of alteration in mgrB gene and plasmid mediate mcr-1 and mcr-2 genes as a source of colistin resistance in 17 non duplicate Klebsiella pneumoniae clinical isolates. METHODS: All isolates classified as resistant to colistin by VITEK 2 system (BioMerieux, Marcy I' Etoile, France) were included...
September 14, 2018: Revista Española de Quimioterapia: Publicación Oficial de la Sociedad Española de Quimioterapia
https://www.readbyqxmd.com/read/30220493/rapid-multiplex-polymerase-chain-reaction-for-detection-of-mcr-1-to-mcr-5-genes
#2
Mathilde Lescat, Laurent Poirel, Patrice Nordmann
A rapid (total time <2 h) and reliable multiplex polymerase chain reaction for screening of mcr-1 to mcr-5 genes conferring resistance to colistin has been developed. This technique has been tested on a collection of isolates previously identified as bearing mcr-1, mcr-2, and mcr-like genes and had a sensitivity and a specificity of 100%. Using this method, we were also able to identify a single isolate possessing both mcr-1 and mcr-5 genes.
April 22, 2018: Diagnostic Microbiology and Infectious Disease
https://www.readbyqxmd.com/read/30053008/mcr-1-and-mcr-2-mcr-6-1-variant-genes-identified-in-moraxella-species-isolated-from-pigs-in-great-britain-from-2014-to-2015
#3
Manal AbuOun, Emma J Stubberfield, Nick A Duggett, Miranda Kirchner, Luisa Dormer, Javier Nunez-Garcia, Luke P Randall, Fabrizio Lemma, Derrick W Crook, Christopher Teale, Richard P Smith, Muna F Anjum
No abstract text is available yet for this article.
October 1, 2018: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29970891/emergence-of-a-novel-mobile-colistin-resistance-gene-mcr-8-in-ndm-producing-klebsiella-pneumoniae
#4
Xiaoming Wang, Yao Wang, Ying Zhou, Jiyun Li, Wenjuan Yin, Shaolin Wang, Suxia Zhang, Jianzhong Shen, Zhangqi Shen, Yang Wang
The rapid increase in carbapenem resistance among gram-negative bacteria has renewed focus on the importance of polymyxin antibiotics (colistin or polymyxin E). However, the recent emergence of plasmid-mediated colistin resistance determinants (mcr-1, -2, -3, -4, -5, -6, and -7), especially mcr-1, in carbapenem-resistant Enterobacteriaceae is a serious threat to global health. Here, we characterized a novel mobile colistin resistance gene, mcr-8, located on a transferrable 95,983-bp IncFII-type plasmid in Klebsiella pneumoniae...
July 4, 2018: Emerging Microbes & Infections
https://www.readbyqxmd.com/read/29885757/detection-of-colistin-resistant-gram-negative-rods-by-using-the-superpolymyxin-medium
#5
Aurélie Jayol, Laurent Poirel, Catherine André, Véronique Dubois, Patrice Nordmann
The commercial SuperPolymyxin medium (ELITechGroup, Puteaux, France), currently licensed in Europe, is aimed to screen for either intrinsic or acquired colistin resistance in Gram negatives. It was tested for screening colistin-resistant Gram-negative rods from bacterial cultures of 145 colistin-resistant and 86 colistin-susceptible Gram-negative rods isolates. It exhibited a sensitivity and specificity of 95.2% (138/145) and 95.3% (82/86), respectively. The sensitivity for the detection of the 25 isolates carrying plasmid-mediated colistin resistance genes (mcr-1, mcr-2, mcr-3, and mcr-4) from bacterial cultures was of 100%...
October 2018: Diagnostic Microbiology and Infectious Disease
https://www.readbyqxmd.com/read/29866140/screening-for-fecal-presence-of-colistin-resistant-escherichia-coli-and-mcr-1-and-mcr-2-genes-in-camel-calves-in-southern-tunisia
#6
Mohamed Rhouma, Salma Bessalah, Imed Salhi, William Thériault, John Morris Fairbrother, Philippe Fravalo
Camels (Camelus dromedarius) are known to harbor multidrug resistant Gram-negative bacteria and to be involved in the transmission of various microorganisms to humans. Data on the occurrence of colistin resistant Escherichia coli as well as mobilized colistin resistance (mcr) genes in camels are lacking. We investigated the presence of colistin resistance and mcr (1-2) genes in E. coli from the feces of camels in Tunisia. Presumptive E. coli isolates from camel-calves in southern Tunisia were qualitatively screened for growth on Mueller-Hinton agar supplemented with 2 mg/L of colistin...
June 5, 2018: Acta Veterinaria Scandinavica
https://www.readbyqxmd.com/read/29774212/alkaline-peptone-water-based-enrichment-method-for-mcr-3-from-acute-diarrheic-outpatient-gut-samples
#7
Qiaoling Sun, Yanyan Hu, Hongwei Zhou, Lingbin Shu, Hanyu Wang, Zixian Huang, Rong Zhang
A third plasmid-mediated colistin resistance gene, mcr-3 , is increasingly being reported in Enterobacteriaceae and Aeromonas spp. from animals and humans. To investigate the molecular epidemiology of mcr in the gut flora of Chinese outpatients, 152 stool specimens were randomly collected from outpatients in our hospital from May to June, 2017. Stool specimens enriched in alkaline peptone water or Luria-Bertani (LB) broth were screened for mcr-1, mcr-2 , and mcr-3 using polymerase chain reaction (PCR)-based assays...
2018: Frontiers in Medicine
https://www.readbyqxmd.com/read/29712655/genetic-and-functional-characterization-of-an-mcr-3-like-enzyme-producing-escherichia-coli-isolate-recovered-from-swine-in-brazil
#8
Nicolas Kieffer, Patrice Nordmann, Andrea Micke Moreno, Luisa Zanolli Moreno, Richard Chaby, Aude Breton, Pierre Tissières, Laurent Poirel
A collection of 126 pigs was screened for carriage of colistin-resistant Enterobacteriaceae in a farm in Minas Gerais, Brazil. Out of this collection, eight colistin-resistant Escherichia coli isolates were recovered, including one from Minas Gerais State producing a new MCR-3 variant (MCR-3.12). Analysis of the lipopolysaccharide revealed that MCR-3.12 had a function similar to that of MCR-1 and MCR-2 as a result of the addition of a phosphoethanolamine group to the lipid A moiety. Genetic analysis showed that the mcr-3...
July 2018: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29696722/the-first-human-report-of-mobile-colistin-resistance-gene-mcr-1-in-finland
#9
Kirsi Gröndahl-Yli-Hannuksela, Emilia Lönnqvist, Teemu Kallonen, Laura Lindholm, Jari Jalava, Kaisu Rantakokko-Jalava, Jaana Vuopio
Colistin resistance mediated by mobile mcr-1 gene has raised concern during the last years. After steep increase in mcr-1 reports, other mcr-gene variants (mcr-2 to mcr-5) have been revealed as well. In 2016, a clinical study was conducted on asymptomatic stool carriage of extended spectrum beta-lactamase (ESBL) producing Escherichia coli and Klebsiella pneumoniae among Finnish adults. All suspected ESBL producing bacterial isolates were first tested by phenotypic ESBL-confirmation methods, and then further analyzed with whole genome sequencing to identify the resistance genes...
May 2018: APMIS: Acta Pathologica, Microbiologica, et Immunologica Scandinavica
https://www.readbyqxmd.com/read/29608599/prevalence-of-mcr-type-genes-among-colistin-resistant-enterobacteriaceae-collected-in-2014-2016-as-part-of-the-inform-global-surveillance-program
#10
Mark G Wise, Mark A Estabrook, Daniel F Sahm, Gregory G Stone, Krystyna M Kazmierczak
A set of 908 clinically derived colistin-resistant Enterobacteriaeae isolates collected worldwide in 2014-2016 were screened for the presence of the plasmid-borne mcr-1, mcr-2, mcr-3, mcr-4 and mcr-5 genes. In total 3.2% (29/908) of the collection were positive for mcr, including 27 Escherichia coli, 1 Klebsiella pneumoniae and 1 Enterobacter cloacae. Twenty-four isolates possessed genes from the mcr-1 family, including the original mcr-1 (n = 22), as well as mcr-1.2 (n = 1) and mcr-1.5 (n = 1), which each differ from mcr-1 by encoding single amino acid variations...
2018: PloS One
https://www.readbyqxmd.com/read/29487327/molecular-detection-of-colistin-resistance-genes-mcr-1-mcr-2-and-mcr-3-in-nasal-oropharyngeal-and-anal-cloacal-swabs-from-pigs-and-poultry
#11
Jilei Zhang, Li Chen, Jiawei Wang, Afrah Kamal Yassin, Patrick Butaye, Patrick Kelly, Jiansen Gong, Weina Guo, Jing Li, Min Li, Feng Yang, Zhixing Feng, Ping Jiang, Chunlian Song, Yaoyao Wang, Jinfeng You, Yi Yang, Stuart Price, Kezong Qi, Yuan Kang, Chengming Wang
Antimicrobial resistance against colistin has emerged worldwide and is threatening the efficacy of colistin treatment of multi-resistant Gram-negative bacteria. In this study, PCRs were used to detect mcr genes (mcr-1, mcr-2, mcr-3) in 213 anal and 1,339 nasal swabs from pigs (n = 1,454) in nine provinces of China, and 1,696 cloacal and 1,647 oropharyngeal samples from poultry (n = 1,836) at live-bird markets in 24 provinces. The mcr-1 prevalences in pigs (79.2%) and geese (71.7%) were significantly higher than in chickens (31...
February 27, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29463301/molecular-detection-of-colistin-resistance-genes-mcr-1-to-mcr-5-in-human-vaginal-swabs
#12
Jilei Zhang, Li Chen, Jiawei Wang, Patrick Butaye, Ke Huang, Haixiang Qiu, Xiaomei Zhang, Weijuan Gong, Chengming Wang
OBJECTIVE: Colistin resistance has emerged worldwide and has been threatening the efficacy of one of the last-resort antimicrobials used for treatment of multidrug resistant Gram-negative bacteria. While five colistin resistance genes (mcr-1, mcr-2, mcr-3, mcr-4 and mcr-5) have been described, few data are available on the prevalence of mcr-genes other than mcr-1 in human samples. RESULTS: In this study, the presence of five currently described colistin resistance genes (mcr 1-5) in vaginal swabs of women undergoing infertility evaluation was reported...
February 20, 2018: BMC Research Notes
https://www.readbyqxmd.com/read/29447913/microbiological-surveillance-of-plasmid-mediated-colistin-resistance-in-human-enterobacteriaceae-isolates-in-romagna-northern-italy-august-2016-july-2017
#13
F Del Bianco, M Morotti, M F Pedna, P Farabegoli, V Sambri
OBJECTIVES: To start a surveillance program to investigate the possible diffusion of mobilized colistin resistance genes in Enterobacteriaceae strains isolated in the Unit of Microbiology of the Great Romagna Hub Laboratory. METHODS: All the colistin resistant Enterobacteriaceae, isolated from August 1st 2016 to July 31st 2017, were prospectively evaluated for mcr-1 and mcr-2. Backdated survey of mcr-3, mcr-4 and mcr-5 was performed on the same group of isolates...
April 2018: International Journal of Infectious Diseases: IJID
https://www.readbyqxmd.com/read/29439654/prospective-study-on-human-fecal-carriage-of-enterobacteriaceae-possessing-mcr-1-and-mcr-2-genes-in-a-regional-hospital-in-hong-kong
#14
Wai-Sing Chan, Chun-Hang Au, Dona N Ho, Tsun-Leung Chan, Edmond Shiu-Kwan Ma, Bone Siu-Fai Tang
BACKGROUND: Human fecal carriage of Enterobacteriaceae possessing mobilized colistin resistance genes (mcr-1 and mcr-2) remains obscure in Hong Kong. As part of routine surveillance on emerging antibiotic resistance, we conducted a prospective study on this topic in a regional hospital in Hong Kong. METHODS: From October 31 to November 25, 2016, all fecal specimens submitted for routine analysis were included in this surveillance study. These comprised 672 consecutive routine fecal specimens collected from 616 individuals...
February 13, 2018: BMC Infectious Diseases
https://www.readbyqxmd.com/read/29421359/emergence-of-plasmid-mediated-colistin-resistance-in-cmy-2-producing-escherichia-coli-of-lineage-st2197-in-a-tunisian-poultry-farm
#15
Elaa Maamar, Carla Andrea Alonso, Zaineb Hamzaoui, Nouha Dakhli, Mohamed Salah Abbassi, Sana Ferjani, Mabrouka Saidani, Ilhem Boutiba-Ben Boubaker, Carmen Torres
Our study aimed to investigate colistin resistance and the mechanisms involved in a collection of 35 extended-spectrum beta-lactamase (ESBL) and 13 CMY-2-producing E. coli strains which were previously recovered from chicken gut microbiota in Tunisia, as well as to determine the genetic location of mcr genes. Forty-eight ESBL and CMY-2-producing E. coli strains were obtained from 137 fecal samples of healthy chickens during 2013. These strains were tested for colistin resistance by the broth microdilution method, and screened for mcr-1 and mcr-2 genes by PCR...
March 23, 2018: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/29394397/identification-of-novel-variants-of-the-colistin-resistance-gene-mcr-3-in-aeromonas-spp-from-the-national-resistance-monitoring-programme-germ-vet-and-from-diagnostic-submissions
#16
Inga Eichhorn, Claudia Feudi, Yang Wang, Heike Kaspar, Andrea T Feßler, Antina Lübke-Becker, Geovana Brenner Michael, Jianzhong Shen, Stefan Schwarz
Objectives: To investigate Aeromonas spp. isolates for the presence of the novel resistance gene mcr-3 or variants thereof and to characterize the positive isolates by whole genome sequence analysis. Methods: A total of 479 unrelated Aeromonas isolates were investigated by PCR for the genes mcr-1, mcr-2 and mcr-3. Positive isolates were investigated for their colistin MICs. Species assignment was based on sequence analysis of 16s rRNA and gyrB and rpoB genes. The mcr-carrying contigs obtained by WGS were analysed for the genetic environments of the mcr genes...
May 1, 2018: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29319341/emerging-mechanisms-of-antimicrobial-resistance-in-bacteria-and-fungi-advances-in-the-era-of-genomics
#17
John Osei Sekyere, Jonathan Asante
Bacteria and fungi continue to develop new ways to adapt and survive the lethal or biostatic effects of antimicrobials through myriad mechanisms. Novel antibiotic resistance genes such as lsa(C), erm(44), VCC-1, mcr-1, mcr-2, mcr-3, mcr-4, bla KLUC-3 and bla KLUC-4 were discovered through comparative genomics and further functional studies. As well, mutations in genes that hitherto were unknown to confer resistance to antimicrobials, such as trm, PP2C, rpsJ, HSC82, FKS2 and Rv2887, were shown by genomics and transcomplementation assays to mediate antimicrobial resistance in Acinetobacter baumannii, Staphylococcus aureus, Enterococcus faecium, Saccharomyces cerevisae, Candida glabrata and Mycobacterium tuberculosis, respectively...
February 2018: Future Microbiology
https://www.readbyqxmd.com/read/29288722/comparative-analysis-of-phosphoethanolamine-transferases-involved-in-polymyxin-resistance-across-10-clinically-relevant-gram-negative-bacteria
#18
COMPARATIVE STUDY
Jiayuan Huang, Yan Zhu, Mei-Ling Han, Mengyao Li, Jiangning Song, Tony Velkov, Chen Li, Jian Li
The rapid emergence of Gram-negative 'superbugs' has become a significant threat to human health globally, and polymyxins have become a last-line therapy for these very problematic pathogens. Polymyxins exhibit their antibacterial killing by initial interaction with lipid A in Gram-negative bacteria. Polymyxin resistance can be mediated by phosphoethanolamine (PEA) modification of lipid A, which abolishes the initial electrostatic interaction with polymyxins. Both chromosome-encoded (e.g. EptA, EptB and EptC) and plasmid-encoded (e...
April 2018: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/29250044/clonal-diversity-virulence-potential-and-antimicrobial-resistance-of-escherichia-coli-causing-community-acquired-urinary-tract-infection-in-switzerland
#19
Magdalena T Nüesch-Inderbinen, Melinda Baschera, Katrin Zurfluh, Herbert Hächler, Hansjakob Nüesch, Roger Stephan
Objectives: The aim of this study was to assess the clonal structure, virulence potential and antibiotic susceptibility of uropathogenic Escherichia coli (UPEC) isolates causing community acquired urinary tract infection (CAUTI) in unselected primary care patients in Switzerland. Methods: We performed multilocus sequence typing, virulence factor determination, and phenotypic and genotypic antimicrobial resistance testing on 44 non-duplicate UPEC isolates. Results: Twenty-seven different sequence types (STs) were identified...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29237785/-mcr-3-and-mcr-4-variants-in-carbapenemase-producing-clinical-enterobacteriaceae-do-not-confer-phenotypic-polymyxin-resistance
#20
LETTER
Jeanette W P Teo, Marimuthu Kalisvar, Indumathi Venkatachalam, Oon Tek Ng, Raymond T P Lin, Sophie Octavia
No abstract text is available yet for this article.
March 2018: Journal of Clinical Microbiology
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