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genetics of antimicrobial resistance

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https://www.readbyqxmd.com/read/28089718/cathelicidin-antimicrobial-peptide-from-alligator-mississippiensis-has-antibacterial-activity-against-multi-drug-resistant-acinetobacter-baumanii-and-klebsiella-pneumoniae
#1
Stephanie M Barksdale, Evelyn J Hrifko, Monique L van Hoek
Alligator mississippiensis (American alligator), a member of order Crocodilia, lives in bacteria-laden environments but is not often known to succumb to bacterial infections. Their serum has been shown to have antibacterial activity beyond that of human serum, and it is believed that this activity is partially due to cationic antimicrobial peptides (CAMPs). CAMPs are produced by many organisms as part of the innate immune system. CAMPs are attractive possible therapies against multi-drug resistant bacteria, such as those found in biofilm-infected war wounds, because they seldom cause genetic resistance in bacteria and are effective against antibiotic resistant bacteria...
January 12, 2017: Developmental and Comparative Immunology
https://www.readbyqxmd.com/read/28088916/an-increasing-threat-in-an-iranian-referral-children-s-hospital-multidrug-resistant-acinetobacter-baumannii
#2
Setareh Mamishi, Reza Habibi, Babak Pourakbari, Shima Mahmoudi, Mohammad Taghi Haghi Ashtiani, Reihaneh Hosseinpour Sadeghi, Mahmoud Khodabandeh
INTRODUCTION: Acinetobacter baumannii has emerged as an important nosocomial pathogen in the past decades. Due to the prevalence of A. baumannii across the world, suitable typing methods to investigate the epidemiological distribution of the organism have been developed. The aim of this study was to investigate the epidemiological and molecular diversity of A. baumannii strains isolated from nosocomial infections of hospitalized children in Children Medical Center Hospital (CMC), an Iranian referral hospital, in Tehran, Iran...
January 13, 2017: Infectious Disorders Drug Targets
https://www.readbyqxmd.com/read/28087584/emergence-of-klebsiella-variicola-positive-for-ndm-9-a-variant-of-new-delhi-metallo-%C3%AE-lactamase-in-an-urban-river-in-south-korea
#3
Doris Y W Di, Jeonghwan Jang, Tatsuya Unno, Hor-Gil Hur
OBJECTIVES: To examine the presence of pathogenic bacteria carrying New Delhi metallo-β-lactamase in the environment and to characterize the genome structures of these strains. METHODS: Phenotypic screening of antimicrobial susceptibility and WGS were conducted on three Klebsiella variicola strains possessing NDM-9 isolated from an urban river. RESULTS: Three carbapenem-resistant K. variicola isolated from Gwangju tributary were found to possess blaNDM-9 genes...
January 12, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28080212/heterogeneity-of-carbapenem-resistance-mechanisms-among-gram-negative-pathogens-in-lebanon-results-of-the-first-cross-sectional-countrywide-study
#4
Dalal Hammoudi Halat, Carole Ayoub Moubareck, Dolla Karam Sarkis
Carbapenem-resistant Gram-negative pathogens have progressively disseminated to different countries worldwide, presenting a serious public health concern. The aims of this study were to determine the prevalence of carbapenem resistance in Gram-negative bacteria in Lebanon, to elucidate molecular mechanisms, and to identify genetic relatedness of incriminated strains. Carbapenem nonsusceptible Enterobacteriaceae, Acinetobacter baumannii, and Pseudomonas were collected from 11 Lebanese hospitals in 2012. Antimicrobial susceptibility was assessed with phenotypic tests, genes encoding carbapenemases were screened via PCR-sequencing, and genetic relatedness was examined by PGFE and ERIC-PCR...
January 12, 2017: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
https://www.readbyqxmd.com/read/28074049/in-vitro-antibacterial-activity-of-%C3%AE-methoxyimino-acylide-derivatives-against-macrolide-resistant-pathogens-and-mutation-analysis-in-23s-rrna
#5
Hiroyuki Sugiyama, Ippei Yoshida, Mayumi Ueki, Katsuhiko Tanabe, Akira Manaka, Keiichi Hiramatsu
We characterized in vitro activities of α-methoxyimino acylides against macrolide-resistant clinical isolates of Streptococcus pneumoniae, Streptococcus pyogenes and Mycoplasma pneumoniae with ribosome modification or substitution and selected acylide-resistant mutants to clarify the binding point of the acylides. The acylides had low MICs against erm(B) gene-containing S. pneumoniae and S. pyogenes (MIC90s, 1-4 μg ml(-1)). For M. pneumoniae, although they had poor potencies against macrolide-resistant strains with the A2058G (Escherichia coli numbering) mutation in 23S rRNA (MICs, >32 μg ml(-1)), one of them showed in vitro activities against macrolide-resistant strains with the A2058U or A2059G mutations (MICs, 0...
January 11, 2017: Journal of Antibiotics
https://www.readbyqxmd.com/read/28071145/bacteriophages-and-their-derivatives-for-the-treatment-and-control-of-food-producing-animal-infections
#6
Carla Carvalho, Ana Rita Costa, Filipe Silva, Ana Oliveira
Nowadays, the world is facing an increasing emergence of antibiotic resistant bacteria. Simultaneously, the banning of some existing antibiotics and the lack of development of new antimicrobials have created an urgent need to find new alternatives against animal infections. Bacteriophages (phages) are naturally occurring predators of bacteria, ubiquitous in the environment, with high host specificity and harmless to animals. For these reasons, phages and their derivatives are being considered valuable antimicrobial alternatives and an opportunity to reduce the current use of antibiotics in agri-food production, increasing animal productivity and providing environmental protection...
January 10, 2017: Critical Reviews in Microbiology
https://www.readbyqxmd.com/read/28062464/extraintestinal-pathogenic-and-antimicrobial-resistant-escherichia-coli-including-sequence-type-131-st131-from-retail-chicken-breasts-united-states-2013
#7
James R Johnson, Stephen B Porter, Brian Johnston, Paul Thuras, Sarah Clock, Michael Crupain, Urvashi Rangan
: Chicken meat products are hypothesized to be vehicles for transmitting antimicrobial-resistant and extraintestinal pathogenic Escherichia coli (ExPEC) to consumers. To reassess this hypothesis in the current era of heightened concerns about food animal antimicrobial use, we analyzed 175 chicken-source E. coli isolates from a 2013 Consumer Reports national survey. Isolates were PCR-screened for ExPEC-defining virulence genes. The 25 ExPEC isolates (12% of 175) and a 2:1 randomly selected set of 50 non-ExPEC isolates were assessed for phylogenetic/clonal background and virulence genotypes, for comparison with resistance profiles and label claims ("organic", "no antibiotics", and "natural")...
January 6, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28062293/distribution-of-resistance-genetic-determinants-among-vibrio-cholerae-isolates-of-2012-and-2013-outbreaks-in-ir-iran
#8
Niloofar Rezaie, Bita Bakhshi, Shahin Najar-Peerayeh
The objective of this study was to characterize antimicrobial resistance determinants in relation to antimicrobial susceptibility and genotyping profile in 20 clinical isolates of Vibrio cholerae. All of the isolates were resistant to streptomycin. The second most prevalent resistance was observed to trimethoprim (75%), co-trimoxazole (60%), tetracycline (50%), and minocycline (45%). About 50% of the isolates fulfilled the criteria of Multi Drug Resistance (MDR) phenotype. None of the isolates carried tet A, B, C, and, D determinants...
January 3, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28056788/genotype-variation-and-genetic-relationship-among-escherichia-coli-from-nursery-pigs-located-in-different-pens-in-the-same-farm
#9
Ana Herrero-Fresno, Shahana Ahmed, Monica Hegstad Hansen, Matthew Denwood, Camilla Zachariasen, John Elmerdahl Olsen
BACKGROUND: So far, little is known about the genetic diversity and relatedness among Escherichia coli (E. coli) populations in the gut of swine. Information on this is required to improve modeling studies on antimicrobial resistance aiming to fight its occurrence and development. This work evaluated the genotype variation of E. coli isolated from swine fecal samples at the single pig and pen level, as well as between pens using repetitive extragenic palindromic (REP) PCR fingerprinting and pulsed field gel electrophoresis (PFGE)...
January 5, 2017: BMC Microbiology
https://www.readbyqxmd.com/read/28056746/innovative-approaches-for-controlling-clinically-relevant-biofilms-current-trends-and-future-prospects
#10
Kristina Ivanova, Eva Ramon, Javier Hoyo, Tzanko Tzanov
Bacteria that colonize and form biofilms on living tissues and medical devices are a global healthcare concern. They cause life threatening infections and are associated with increased mortality and morbidity in the hospitals. Although antibiotics have been successfully applied for treatment of bacterial diseases, the adaptive and genetic changes of the microorganisms within the biofilms make them inherently resistant to all known antibacterial agents. Therefore, novel antimicrobial strategies that do not exert selective pressure on bacterial population and minimize the risk of resistance occurrence have been sought to prevent and treat biofilm related infections...
January 5, 2017: Current Topics in Medicinal Chemistry
https://www.readbyqxmd.com/read/28053211/optical-screening-for-rapid-antimicrobial-susceptibility-testing-and-for-observation-of-phenotypic-diversity-among-the-genetically-clonal-species-bacillus-anthracis
#11
Heather P McLaughlin, Amy S Gargis, Pierre Michel, David Sue, Linda M Weigel
: During high-impact events involving Bacillus anthracis, such as the Amerithrax incident of 2001 or the anthrax outbreaks in Russia and Sweden in 2016, critical decisions to reduce morbidity and mortality include rapid selection and distribution of effective antimicrobial agents for treatment and post-exposure prophylaxis. Detection of antimicrobial resistance currently relies on a conventional broth microdilution (BMD) method that requires a 16 - 20 hour incubation time for B. anthracis Advances in high-resolution optical screening offer a new technology to more rapidly evaluate antimicrobial susceptibility and to simultaneously assess growth characteristics of an isolate...
January 4, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28040165/antimicrobial-susceptibility-and-genetic-characterization-of-escherichia-coli-recovered-from-frozen-game-meat
#12
Rafael H Mateus-Vargas, Viktoria Atanassova, Felix Reich, Günter Klein
The increasing number of antimicrobial resistant Enterobacteriaceae both in veterinary and human medicine, the dissemination of these bacteria in several environments and their possible repercussions on human health is causing concern. Game meat is usually seen as free of antimicrobial resistant bacteria. The objective of this study was to evaluate the current antimicrobial susceptibility status in generic Escherichia coli isolated from packed frozen game meat from a game handling establishment in Germany. A total of 229 E...
May 2017: Food Microbiology
https://www.readbyqxmd.com/read/28036056/genetic-regulation-of-virulence-and-antibiotic-resistance-in-acinetobacter-baumannii
#13
REVIEW
Carsten Kröger, Stefani C Kary, Kristina Schauer, Andrew D S Cameron
Multidrug resistant microorganisms are forecast to become the single biggest challenge to medical care in the 21st century. Over the last decades, members of the genus Acinetobacter have emerged as bacterial opportunistic pathogens, in particular as challenging nosocomial pathogens because of the rapid evolution of antimicrobial resistances. Although we lack fundamental biological insight into virulence mechanisms, an increasing number of researchers are working to identify virulence factors and to study antibiotic resistance...
December 28, 2016: Genes
https://www.readbyqxmd.com/read/28032542/the-molecular-epidemiology-and-antimicrobial-resistance-phenotypes-of-acinetobacter-baumannii-isolated-from-patients-in-three-hospitals-in-southern-vietnam
#14
Nguyen Tuan Anh, Tran Vu Thieu Nga, Huynh Minh Tuan, Nguyen Si Tuan, Dao Minh Y, Nguyen Van Vinh Chau, Stephen Baker, Ho Huynh Thuy Duong
Multidrug resistance (MDR) in the nosocomial pathogen Acinetobacter baumannii limits therapeutic options and impacts on clinical care. Resistance against carbapenems, a group of last-resort antimicrobials for treating MDR A. baumannii infections, is associated with the expression (and over-expression) of carbapenemases encoded by the blaOXA genes. The aim of this study was to determine the prevalence of antimicrobial resistant A. baumannii associated with infection in three hospitals in southern Vietnam and to characterise the genetic determinants associated with resistance against carbapenems...
December 28, 2016: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/28032486/current-situation-of-antimicrobial-resistance-and-genetic-differences-in-stenotrophomonas-maltophilia-complex-isolates-by-multilocus-variable-number-of-tandem-repeat-analysis
#15
Ji Young Rhee, Jae Hoon Song, Kwan Soo Ko
BACKGROUND: Stenotrophomonas maltophilia is one of several opportunistic pathogens of growing significance. Several studies on the molecular epidemiology of S. maltophilia have shown clinical isolates to be genetically diverse. MATERIALS AND METHODS: A total of 121 clinical isolates tentatively identified as S. malophilia from seven tertiary-care hospitals in Korea from 2007 to 2011 were included. Species and groups were identified using partial gyrB gene sequences and antimicrobial susceptibility testing was performed using a broth microdilution method...
December 2016: Infection & Chemotherapy
https://www.readbyqxmd.com/read/28030622/effects-of-menthol-supplementation-in-feedlot-cattle-diets-on-the-fecal-prevalence-of-antimicrobial-resistant-escherichia-coli
#16
C C Aperce, R Amachawadi, C L Van Bibber-Krueger, T G Nagaraja, H M Scott, J Vinasco-Torre, J S Drouillard
The pool of antimicrobial resistance determinants in the environment and in the gut flora of cattle is a serious public health concern. In addition to being a source of human exposure, these bacteria can transfer antibiotic resistance determinants to pathogenic bacteria and endanger the future of antimicrobial therapy. The occurrence of antimicrobial resistance genes on mobile genetic elements, such as plasmids, facilitates spread of resistance. Recent work has shown in vitro anti-plasmid activity of menthol, a plant-based compound with the potential to be used as a feed additive to beneficially alter ruminal fermentation...
2016: PloS One
https://www.readbyqxmd.com/read/28018320/single-molecule-sequencing-pacbio-of-the-staphylococcus-capitis-nrcs-a-clone-reveals-the-basis-of-multidrug-resistance-and-adaptation-to-the-neonatal-intensive-care-unit-environment
#17
Patrícia Martins Simões, Hajar Lemriss, Yann Dumont, Sanâa Lemriss, Jean-Philippe Rasigade, Sophie Assant-Trouillet, Azeddine Ibrahimi, Saâd El Kabbaj, Marine Butin, Frédéric Laurent
The multi-resistant Staphylococcus capitis clone NRCS-A has recently been described as a major pathogen causing nosocomial, late-onset sepsis (LOS) in preterm neonates worldwide. NRCS-A representatives exhibit an atypical antibiotic resistance profile. Here, the complete closed genome (chromosomal and plasmid sequences) of NRCS-A prototype strain CR01 and the draft genomes of three other clinical NRCS-A strains from Australia, Belgium and the United Kingdom are annotated and compared to available non-NRCS-A S...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28017602/a-common-platform-for-antibiotic-dereplication-and-adjuvant-discovery
#18
Georgina Cox, Arthur Sieron, Andrew M King, Gianfranco De Pascale, Andrew C Pawlowski, Kalinka Koteva, Gerard D Wright
Solving the antibiotic resistance crisis requires the discovery of new antimicrobial drugs and the preservation of existing ones. The discovery of inhibitors of antibiotic resistance, antibiotic adjuvants, is a proven example of the latter. A major difficulty in identifying new antibiotics is the frequent rediscovery of known compounds, necessitating laborious "dereplication" to identify novel chemical entities. We have developed an antibiotic resistance platform (ARP) that can be used for both the identification of antibiotic adjuvants and for antibiotic dereplication...
November 29, 2016: Cell Chemical Biology
https://www.readbyqxmd.com/read/28012984/virulence-factors-and-antimicrobial-susceptibility-profile-of-extraintestinal-escherichia-coli-isolated-from-an-avian-colisepticemia-outbreak
#19
Jonas Fernandes Maciel, Letícia Beatriz Matter, Michele Martins Trindade, Giovana Camillo, Maristela Lovato, Sônia de Ávila Botton, Agueda Castagna de Vargas
In this study an avian colisepticemia outbreak was investigated. Two isolates from a chicken with colisepticemia were characterized for antimicrobial susceptibility and virulence factors profile. For this purpose 7 antimicrobial and 29 genes (fimH, hrlA/hek, iha, papC, sfa/focCD, tsh, mat, tia, gimB, ibeA, chuA, fyuA, ireA, iroN, irp2, iucD, sitD. chr., sitD. ep., iss, neuC, ompA, traT, astA, hlyA, sat, vat, pic, malX, cvi/cva) were tested. The outbreak happened in a hick chicken breeding located in the northwestern region of Rio Grande do Sul state in South of Brazil and caused 28...
December 21, 2016: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28011349/elevated-prevalence-of-multidrug-resistant-acinetobacter-baumannii-with-extensive-genetic-diversity-in-the-largest-burn-centre-of-northeast-iran
#20
Nazanin Sarhaddi, Saman Soleimanpour, Hadi Farsiani, Arman Mosavat, Samaneh Dolatabadi, Himen Salimizand, Saeid Amel Jamehdar
OBJECTIVES: The emergence and spread of multidrug-resistant (MDR) Acinetobacter baumannii isolates is now frequently associated with nosocomial infections. The aim of this study was to evaluate the genetic relatedness and patterns of antimicrobial resistance amongst A. baumannii isolated from a burn centre at a teaching hospital in Iran. METHODS: A total of 54 A. baumannii isolates were collected from burn wound infections of hospitalised patients. Antimicrobial susceptibility of the isolates was determined, and genotyping analysis was performed by repetitive extragenic palindromic PCR (rep-PCR)...
December 21, 2016: Journal of Global Antimicrobial Resistance
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