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Luisa Z Moreno, Vasco T M Gomes, Jéssica Moreira, Carolina H de Oliveira, Bárbara P Peres, Ana Paula S Silva, Siddhartha Thakur, Roberto M La Ragione, Andrea M Moreno
Brazilian poultry meat samples were screened for colistin-resistant Salmonella enterica. Sixty Salmonella isolates were tested for in vitro colistin resistance and mcr-1, mcr-2, mcr-3 and mcr-4 genes. Two isolates harbored the mcr-1 gene and whole-genome analysis determined the serovar to be Schwarzengrund, ST96, harboring the IncX4 plasmid. This is the first report of mcr-1-harboring Salmonella enterica serovar Schwarzengrund in Brazil.
November 1, 2018: Diagnostic Microbiology and Infectious Disease
X Zhang, B Zhang, Y Guo, J Wang, P Zhao, J Liu, K He
The global dissemination of colistin resistance has received a great deal of attention. Recently, the plasmid-mediated colistin resistance encoded by mcr genes in Escherichia coli (E. coli) strains from animals, food, and patients in China has been reported frequently. To investigate the colistin resistance and mcr-1 and mcr-2 genes spread in domestic animals in Jiangsu Province, we collected fecael swabs from pigs, chicken and cattle at different ages distributed in intensive feeding farms. The selective chromogenic agar and mcr-PCR were used to screen the colistin resistance and mcr gene carriage...
November 22, 2018: International Journal of Food Microbiology
Xiaohua He, Daniela Mavrici, Stephanie Patfield, Fernando M Rubio
The recent discovery and rapid spread of mobile colistin-resistant gene, mcr-1, among bacteria isolated from a broad range of sources is undermining our ability to treat bacterial infections and threatening human health and safety. To prevent further transfer of colistin resistance, practical and reliable methods for mcr-1-containing bacteria are need. In this study, standards and novel polyclonal and monoclonal antibodies (mAbs) against MCR-1 were developed. Among nine mAbs, three were MCR-1 specific and six cross-reacted with both MCR-1 and MCR-2...
November 13, 2018: Scientific Reports
Tommaso Giani, Samanta Sennati, Alberto Antonelli, Vincenzo Di Pilato, Tiziana di Maggio, Antonia Mantella, Claudia Niccolai, Michele Spinicci, Joaquín Monasterio, Paul Castellanos, Mirtha Martinez, Fausto Contreras, Dorian Balderrama Villaroel, Esther Damiani, Sdenka Maury, Rodolfo Rocabado, Lucia Pallecchi, Alessandro Bartoloni, Gian Maria Rossolini
BackgroundThe mcr-1 gene is a transferable resistance determinant against colistin, a last-resort antimicrobial for infections caused by multi-resistant Gram-negatives.AimTo study carriage of antibiotic-resistant bacteria in healthy school children as part of a helminth control and antimicrobial resistance survey in the Bolivian Chaco region.MethodsFrom September to October 2016 we collected faecal samples from healthy children in eight rural villages. Samples were screened for mcr-1 - and mcr-2 genes. Antimicrobial susceptibility testing was performed, and a subset of 18 isolates representative of individuals from different villages was analysed by whole genome sequencing (WGS)...
November 2018: Euro Surveillance: Bulletin Européen sur les Maladies Transmissibles, European Communicable Disease Bulletin
Gabhan Chalmers, Kristin E Davis, Zvonimir Poljak, Robert Friendship, Michael R Mulvey, Anne E Deckert, Richard J Reid-Smith, Patrick Boerlin
Colistin is one of the last-resort antibiotics for the treatment of multidrug-resistant infections in humans, but transmissible colistin-resistance genes have emerged in bacteria from animals. The rapid and sensitive detection among animals of colonization with bacteria carrying these genes is critical in helping to control further spread. Here we describe a method for broth enrichment of colistin-resistant Escherichia coli from animal fecal and cecal samples followed by real-time polymerase chain reaction (PCR) for the simultaneous detection of two of the main colistin-resistance genes, mcr-1 and mcr-2...
October 2018: Canadian Journal of Veterinary Research, Revue Canadienne de Recherche Vétérinaire
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...
October 2018: Revista Española de Quimioterapia: Publicación Oficial de la Sociedad Española de Quimioterapia
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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